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hierynomus / sshj

ssh, scp and sftp for java
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Bad packet length after SSH_MSG_KEXINIT #670

Open jmatias-assia opened 3 years ago

jmatias-assia commented 3 years ago

Hi all,

I'm getting the following when upgrading sshj from 0.18 to 0.31.

a) 0.31 - bad packet length:

2021-03-09 19:49:21,322 [pool-InterpreterHandler_TELNET-thread-4] INFO  telnetproxy.SshClientConfig  - Getting algorithm for seeding
2021-03-09 19:49:21,322 [pool-InterpreterHandler_TELNET-thread-4] INFO  telnetproxy.SshClientConfig  - Generating seed
2021-03-09 19:49:21,323 [pool-InterpreterHandler_TELNET-thread-4] INFO  telnetproxy.SshClientConfig  - Seed generated
2021-03-09 19:49:21,344 [pool-InterpreterHandler_TELNET-thread-4] DEBUG sshj.DefaultConfig  - Available cipher factories: [aes128-cbc, aes128-ctr, aes192-cbc, aes192-ctr, aes256-cbc, aes256-ctr, aes128-gcm@openssh.com, aes256-gcm@openssh.com, blowfish
-cbc, blowfish-ctr, cast128-cbc, cast128-ctr, idea-cbc, idea-ctr, serpent128-cbc, serpent128-ctr, serpent192-cbc, serpent192-ctr, serpent256-cbc, serpent256-ctr, 3des-cbc, 3des-ctr, twofish128-cbc, twofish128-ctr, twofish192-cbc, twofish192-ctr, twofi
sh256-cbc, twofish256-ctr, twofish-cbc, arcfour, arcfour128, arcfour256]
2021-03-09 19:49:21,355 [pool-InterpreterHandler_TELNET-thread-4] INFO  transport.TransportImpl  - Client identity string: SSH-2.0-SSHJ_0.31.0
2021-03-09 19:49:21,377 [pool-InterpreterHandler_TELNET-thread-4] INFO  transport.TransportImpl  - Server identity string: SSH-2.0-RomSShell_4.31
2021-03-09 19:49:21,378 [pool-InterpreterHandler_TELNET-thread-4] DEBUG transport.KeyExchanger  - Sending SSH_MSG_KEXINIT
2021-03-09 19:49:21,381 [reader] TRACE transport.Decoder  - Received packet #0: 14 f0 61 57 c8 c2 86 ce 6e e9 67 e7 f0 36 95 3a e7 00 00 00 1a 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 2d 73 68 61 31 00 00 00 07 73 73 68 2d 64 73
73 00 00 00 08 33 64 65 73 2d 63 62 63 00 00 00 08 33 64 65 73 2d 63 62 63 00 00 00 09 68 6d 61 63 2d 73 68 61 31 00 00 00 09 68 6d 61 63 2d 73 68 61 31 00 00 00 04 6e 6f 6e 65 00 00 00 04 6e 6f 6e 65 00 00 00 00 00 00 00 00 00 00 00 00 00
2021-03-09 19:49:21,383 [reader] TRACE transport.TransportImpl  - Received packet KEXINIT
2021-03-09 19:49:21,383 [reader] DEBUG transport.KeyExchanger  - Received SSH_MSG_KEXINIT
2021-03-09 19:49:21,384 [pool-InterpreterHandler_TELNET-thread-4] TRACE transport.Encoder  - Encoding packet #0: 14 cc 91 04 3d 4c 04 5d 0d 40 45 29 b1 04 67 28 5b 00 00 02 a7 63 75 72 76 65 32 35 35 31 39 2d 73 68 61 32 35 36 2c 63 75 72 76 65 32 35
35 31 39 2d 73 68 61 32 35 36 40 6c 69 62 73 73 68 2e 6f 72 67 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 32 35 36 2c 65 63 64 68 2d 73 68 61 32 2d 6e 69 73 74 70 35 32 31 2c 65 63 64 68 2d 73
 68 61 32 2d 6e 69 73 74 70 33 38 34 2c 65 63 64 68 2d 73 68 61 32 2d 6e 69 73 74 70 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 31 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 7
2 6f 75 70 31 2d 73 68 61 31 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 34 2d 73 68 61 31 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 34 2d 73 68 61 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d
67 72 6f 75 70 31 35 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 37 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65
 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 38 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 34 2d 73 68 61 32 35 36 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 6
8 61 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 68 61 32 35 36 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 68 61 33 38 34 40 73 73 68 2e 63 6f 6d 2c 64 69
66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 33 38 34 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f
 75 70 31 36 2d 73 68 61 35 31 32 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 38 2d 73 68 61 35 31 32 40 73 73 68 2e 63 6f 6d 2c 65 78 74 2d 69 6e 66 6f 2d 63 00 00 00 ab 73 73 68 2d 65 64 32 35 35 31 39 2
c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 35 32 31 2c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 33 38 34 2c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 32 35 36 2c 72 73 61 2d 73 68 61 32 2d 35 31 32 2c 72 73 61 2d 73 68 61 32 2d 32
35 36 2c 73 73 68 2d 72 73 61 2d 63 65 72 74 2d 76 30 31 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 73 73 68 2d 64 73 73 2d 63 65 72 74 2d 76 30 31 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 73 73 68 2d 72 73 61 2c 73 73 68 2d 64 73 73 00 00 01 a3 61 65 73 31
 32 38 2d 63 62 63 2c 61 65 73 31 32 38 2d 63 74 72 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 73 32 35 36 2d 63 62 63 2c 61 65 73 32 35 36 2d 63 74 72 2c 61 65 73 31 32 38 2d 67 63 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6
d 2c 61 65 73 32 35 36 2d 67 63 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 62 6c 6f 77 66 69 73 68 2d 63 62 63 2c 62 6c 6f 77 66 69 73 68 2d 63 74 72 2c 63 61 73 74 31 32 38 2d 63 62 63 2c 63 61 73 74 31 32 38 2d 63 74 72 2c 69 64 65 61 2d 63 62 63 2c
69 64 65 61 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 74 72 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 62 63 2c
 73 65 72 70 65 6e 74 32 35 36 2d 63 74 72 2c 33 64 65 73 2d 63 62 63 2c 33 64 65 73 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 62 63 2c 74 77 6f 66 69 7
3 68 31 39 32 2d 63 74 72 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 62 63 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 74 72 2c 74 77 6f 66 69 73 68 2d 63 62 63 2c 61 72 63 66 6f 75 72 2c 61 72 63 66 6f 75 72 31 32 38 2c 61 72 63 66 6f 75 72 32 35 36 00 00 01
a3 61 65 73 31 32 38 2d 63 62 63 2c 61 65 73 31 32 38 2d 63 74 72 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 73 32 35 36 2d 63 62 63 2c 61 65 73 32 35 36 2d 63 74 72 2c 61 65 73 31 32 38 2d 67 63 6d 40 6f 70 65 6e 73 73
 68 2e 63 6f 6d 2c 61 65 73 32 35 36 2d 67 63 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 62 6c 6f 77 66 69 73 68 2d 63 62 63 2c 62 6c 6f 77 66 69 73 68 2d 63 74 72 2c 63 61 73 74 31 32 38 2d 63 62 63 2c 63 61 73 74 31 32 38 2d 63 74 72 2c 69 64 65 61 2
d 63 62 63 2c 69 64 65 61 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 74 72 2c 73 65 72 70 65 6e 74 32 35 36
2d 63 62 63 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 74 72 2c 33 64 65 73 2d 63 62 63 2c 33 64 65 73 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 62 63 2c 74
 77 6f 66 69 73 68 31 39 32 2d 63 74 72 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 62 63 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 74 72 2c 74 77 6f 66 69 73 68 2d 63 62 63 2c 61 72 63 66 6f 75 72 2c 61 72 63 66 6f 75 72 31 32 38 2c 61 72 63 66 6f 75 72 32 3
5 36 00 00 01 46 68 6d 61 63 2d 73 68 61 31 2c 68 6d 61 63 2d 73 68 61 31 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63
2d 6d 64 35 2c 68 6d 61 63 2d 6d 64 35 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2c
 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6
d 64 31 36 30 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 39 36 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 00 00 01
46 68 6d 61 63 2d 73 68 61 31 2c 68 6d 61 63 2d 73 68 61 31 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2c
 68 6d 61 63 2d 6d 64 35 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2c 68 6d 61 63 2
d 73 68 61 32 2d 32 35 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30
2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 39 36 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 00 00 00 04 6e 6f 6e 65
 00 00 00 04 6e 6f 6e 65 00 00 00 00 00 00 00 00 00 00 00 00 00
2021-03-09 19:49:21,385 [reader] DEBUG transport.KeyExchanger  - Negotiated algorithms: [ kex=diffie-hellman-group1-sha1; sig=ssh-dss; c2sCipher=3des-cbc; s2cCipher=3des-cbc; c2sMAC=hmac-sha1; s2cMAC=hmac-sha1; c2sComp=none; s2cComp=none; rsaSHA2Support=false ]
2021-03-09 19:49:21,397 [reader] TRACE transport.Encoder  - Encoding packet #1: 1e 00 00 00 80 3f 56 6c 38 36 60 d2 99 eb 0d b5 42 d8 60 f2 e4 ec a2 85 c8 23 a8 71 f5 27 4f b7 55 11 93 cc 6a 12 2b 86 b7 d1 f3 85 e8 55 ed 53 0e 40 7d 73 cf 49 e1 9f 97
f0 b9 37 98 2f e8 04 84 7e a4 f9 25 96 7e 0d 5b e3 e8 a5 fb d4 2f 1a de f7 c7 00 18 9d bd f9 62 d1 d5 41 c6 4b bc 08 3a 54 38 39 b3 0c c4 51 df 9d 93 da 76 f1 0d b9 90 ba 83 b3 0a af 08 1f ea e4 be 37 1e 6f 4e 22 d3 86 d3 6c d4
2021-03-09 19:49:21,398 [reader] TRACE transport.Decoder  - Received packet #1: 01 00 00 00 02 00 00 00 11 42 61 64 20 70 61 63 6b 65 74 20 6c 65 6e 67 74 68 00 00 00 00
2021-03-09 19:49:21,398 [reader] TRACE transport.TransportImpl  - Received packet DISCONNECT
2021-03-09 19:49:21,398 [reader] INFO  transport.TransportImpl  - Received SSH_MSG_DISCONNECT (reason=PROTOCOL_ERROR, msg=Bad packet length)
2021-03-09 19:49:21,398 [reader] ERROR transport.TransportImpl  - Dying because - Bad packet length
net.schmizz.sshj.transport.TransportException: [PROTOCOL_ERROR] Bad packet length
        at net.schmizz.sshj.transport.TransportImpl.gotDisconnect(TransportImpl.java:565)
        at net.schmizz.sshj.transport.TransportImpl.handle(TransportImpl.java:521)
        at net.schmizz.sshj.transport.Decoder.decode(Decoder.java:113)
        at net.schmizz.sshj.transport.Decoder.received(Decoder.java:203)
        at net.schmizz.sshj.transport.Reader.run(Reader.java:60)
2021-03-09 19:49:21,399 [reader] INFO  transport.TransportImpl  - Disconnected - PROTOCOL_ERROR
2021-03-09 19:49:21,399 [reader] DEBUG transport.KeyExchanger  - Got notified of net.schmizz.sshj.transport.TransportException: [PROTOCOL_ERROR] Bad packet length
2021-03-09 19:49:21,399 [reader] DEBUG transport.TransportImpl$NullService  - Notified of net.schmizz.sshj.transport.TransportException: [PROTOCOL_ERROR] Bad packet length

b) In 0.18 everything works fine:

2021-03-09 20:39:34,636 [pool-InterpreterHandler_TELNET-thread-1] INFO  telnetproxy.SshClientConfig  - Getting algorithm for seeding
2021-03-09 20:39:34,636 [pool-InterpreterHandler_TELNET-thread-1] INFO  telnetproxy.SshClientConfig  - Generating seed
2021-03-09 20:39:34,636 [pool-InterpreterHandler_TELNET-thread-1] INFO  telnetproxy.SshClientConfig  - Seed generated
2021-03-09 20:39:34,684 [pool-InterpreterHandler_TELNET-thread-1] DEBUG sshj.DefaultConfig  - Available cipher factories: [net.schmizz.sshj.transport.cipher.AES128CTR$Factory@b5191e2, net.schmizz.sshj.transport.cipher.AES192CTR$Factory@1edffbed, net.schmizz.sshj.transport.cipher.AES256CTR$Factory@70f66466, net.schmizz.sshj.transport.cipher.AES128CBC$Factory@5744cb7, net.schmizz.sshj.transport.cipher.AES192CBC$Factory@2ad037a, net.schmizz.sshj.transport.cipher.AES256CBC$Factory@634c8051, net.schmizz.sshj.transport.cipher.TripleDESCBC$Factory@205a0d0a, net.schmizz.sshj.transport.cipher.BlowfishCBC$Factory@76cfc42, blowfish-ctr, cast128-cbc, cast128-ctr, idea-cbc, idea-ctr, serpent128-cbc, serpent128-ctr, serpent192-cbc, serpent192-ctr, serpent256-cbc, serpent256-ctr, 3des-ctr, twofish128-cbc, twofish128-ctr, twofish192-cbc, twofish192-ctr, twofish256-cbc, twofish256-ctr, twofish-cbc, arcfour, arcfour128, arcfour256]
2021-03-09 20:39:34,700 [pool-InterpreterHandler_TELNET-thread-1] INFO  telnetproxy.SshCommandProcessor  - Connecting to 'Address = 10.238.94.252:22'
2021-03-09 20:42:45,734 [pool-InterpreterHandler_TELNET-thread-1] INFO  transport.TransportImpl  - Client identity string: SSH-2.0-SSHJ_0_17_2
2021-03-09 20:42:45,763 [pool-InterpreterHandler_TELNET-thread-1] INFO  transport.TransportImpl  - Server identity string: SSH-2.0-RomSShell_4.31
2021-03-09 20:42:45,764 [pool-InterpreterHandler_TELNET-thread-1] DEBUG transport.KeyExchanger  - Sending SSH_MSG_KEXINIT
2021-03-09 20:42:45,765 [reader] TRACE transport.Decoder  - Received packet #0: 14 34 9a 33 9d 99 09 94 05 3c 61 db 49 a1 0e c5 32 00 00 00 1a 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 2d 73 68 61 31 00 00 00 07 73 73 68 2d 64 73
73 00 00 00 08 33 64 65 73 2d 63 62 63 00 00 00 08 33 64 65 73 2d 63 62 63 00 00 00 09 68 6d 61 63 2d 73 68 61 31 00 00 00 09 68 6d 61 63 2d 73 68 61 31 00 00 00 04 6e 6f 6e 65 00 00 00 04 6e 6f 6e 65 00 00 00 00 00 00 00 00 00 00 00 00 00
2021-03-09 20:42:45,768 [reader] TRACE transport.TransportImpl  - Received packet KEXINIT
2021-03-09 20:42:45,768 [reader] DEBUG transport.KeyExchanger  - Received SSH_MSG_KEXINIT
2021-03-09 20:42:45,770 [pool-InterpreterHandler_TELNET-thread-1] TRACE transport.Encoder  - Encoding packet #-1: 14 13 fc e5 3e c8 e4 db a8 f9 63 e3 f6 c0 fc 55 cb 00 00 00 d4 63 75 72 76 65 32 35 35 31 39 2d 73 68 61 32 35 36 40 6c 69 62 73 73 68 2e
 6f 72 67 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 32 35 36 2c 65 63 64 68 2d 73 68 61 32 2d 6e 69 73 74 70 35 32 31 2c 65 63 64 68 2d 73 68 61 32 2d 6e 69 73 74 70 33 38 34 2c 65 63 64 68 2
d 73 68 61 32 2d 6e 69 73 74 70 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 31 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 34 2d 73 68 61 31 2c 64 69 66 66 69 65
2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 2d 73 68 61 31 00 00 00 2f 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 32 35 36 2c 73 73 68 2d 72 73 61 2c 73 73 68 2d 64 73 73 2c 73 73 68 2d 65 64 32 35 35 31 39 00 00 01 75 61 65 73 31 32 38 2d 63 74
 72 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 73 32 35 36 2d 63 74 72 2c 61 65 73 31 32 38 2d 63 62 63 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 65 73 32 35 36 2d 63 62 63 2c 33 64 65 73 2d 63 62 63 2c 62 6c 6f 77 66 69 73 68 2d 63 62 63 2c 62 6c 6f 77 6
6 69 73 68 2d 63 74 72 2c 63 61 73 74 31 32 38 2d 63 62 63 2c 63 61 73 74 31 32 38 2d 63 74 72 2c 69 64 65 61 2d 63 62 63 2c 69 64 65 61 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 74 72 2c 73 65 72
70 65 6e 74 31 39 32 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 74 72 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 62 63 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 74 72 2c 33 64 65 73 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 62 63 2c 74 77 6f
 66 69 73 68 31 32 38 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 74 72 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 62 63 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 74 72 2c 74 77 6f 66 69 73 68 2d 63 62 63 2
c 61 72 63 66 6f 75 72 2c 61 72 63 66 6f 75 72 31 32 38 2c 61 72 63 66 6f 75 72 32 35 36 00 00 01 75 61 65 73 31 32 38 2d 63 74 72 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 73 32 35 36 2d 63 74 72 2c 61 65 73 31 32 38 2d 63 62 63 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 65 73 32 35 36 2d 63 62 63 2c 33 64 65 73 2d 63 62 63 2c 62 6c 6f 77 66 69 73 68 2d 63 62 63 2c 62 6c 6f 77 66 69 73 68 2d 63 74 72 2c 63 61 73 74 31 32 38 2d 63 62 63 2c 63 61 73 74 31 32 38 2d 63 74 72 2c 69 64 65 61 2d 63 62 63 2c 69 64 65 61 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 74 72 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 62 63 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 74 72 2c 33 64 65 73 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 74 72 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 62 63 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 74 72 2c 74 77 6f 66 69 73 68 2d 63 62 63 2c 61 72 63 66 6f 75 72 2c 61 72 63 66 6f 75 72 31 32 38 2c 61 72 63 66 6f 75 72 32 35 36 00 00 00 47 68 6d 61 63 2d 73 68 61 31 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 2c 68 6d 61 63 2d 6d 64 35 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 00 00 00 47 68 6d 61 63 2d 73 68 61 31 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 2c 68 6d 61 63 2d 6d 64 35 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 00 00 00 04 6e 6f 6e 65 00 00 00 04 6e 6f 6e 65 00 00 00 00 00 00 00 00 00 00 00 00 00
2021-03-09 20:42:45,771 [reader] DEBUG transport.KeyExchanger  - Negotiated algorithms: [ kex=diffie-hellman-group1-sha1; sig=ssh-dss; c2sCipher=3des-cbc; s2cCipher=3des-cbc; c2sMAC=hmac-sha1; s2cMAC=hmac-sha1; c2sComp=none; s2cComp=none ]
2021-03-09 20:42:45,789 [reader] DEBUG kex.DHG1  - Sending SSH_MSG_KEXDH_INIT
2021-03-09 20:42:45,789 [reader] TRACE transport.Encoder  - Encoding packet #0: 1e 00 00 00 81 00 c0 55 08 d0 b5 d3 76 22 ca 56 51 f6 82 9b 2d 25 d0 76 eb 25 df b8 f5 9d 8c bb df 5a 4a 34 a5 e7 69 4e b2 10 60 fa 24 c9 a3 39 63 c1 dd 46 c4 38 47 a8 4e d2 c1 b1 16 3b 9f 17 4f 23 3e 84 c4 eb 3a fd 69 67 a8 69 0d a9 23 09 2c 70 43 b7 d7 2f 46 6b 14 e8 72 ad 25 1d bc e8 b4 f6 be 2e d7 1f 94 46 fa 71 53 48 32 41 e7 58 60 50 c3 e7 53 48 22 2d cd f8 56 1b df f5 34 d0 ef 98 d1 51 4f 3b
2021-03-09 20:42:46,310 [reader] TRACE transport.Decoder  - Received packet #1: 1f 00 00 01 b0 00 00 00 07 73 73 68 2d 64 73 73 00 00 00 81 00 a6 5f ea ab 51 1c 61 e3 3d f3 8f dd da f0 3b 59 b6 f2 5e 1f a4 de 57 e5 cf 00 ae 47 8a 85 5d da 4f 36 38 d3 8b b0 0a c4 af 7d 84 14 c3 fb 36 e0 4f bd f3 d3 16 67 12 d4 3b 42 1b fa 75 7e 85 69 4a d2 7c 48 f3 96 d0 3c 8b ce 8d a5 8d b5 b8 20 39 f3 5d cf 85 72 35 c2 f1 c7 3b 22 26 a3 61 42 91 90 dc b5 b6 cd 0e df b0 ff 69 33 90 0b 02 ce cc 0c e6 92 74 d8 da e7 c6 94 80 43 18 d6 d6 b9 00 00 00 15 00 b5 af d2 f9 32 46 b1 ef cd 1f 3a 7c 24 0c 1e 9e 21 a3 63 0b 00 00 00 7f 7b bd 2c 5d c9 17 a5 e0 8b 9c 2f 80 a4 9f b6 3f cd 5c 05 78 ba 70 1e 25 4f e3 53 0d ed d3 b6 68 0a 6e 5a fb 32 80 b5 3f 15 40 28 ba ff f7 3d 1b a0 fd b0 00 4b 9e b0 db f2 4b 29 5b f2 a3 56 91 3c d1 c0 be 03 c5 10 3a 1d a8 b7 3e 76 70 b5 6d 71 6e d5 54 7a f6 7b 50 61 31 1e ea 24 5e 2e 5c 33 78 43 cb c1 35 b9 b9 c1 87 75 d5 d5 6c fd a3 1b 74 7e 24 49 86 1a df 3b 3f 72 71 89 c0 a3 00 00 00 80 6b 19 8c d1 a2 fa f6 7f 9a 32 aa 9d f1 f3 9c 5c be 0d 90 1f 5c fa 48 3e bf 62 0c a6 40 53 0f cf 27 06 a9 ce 75 90 1e 86 e1 65 cf 06 66 9f 38 b7 16 6b e5 dd 5d e1 f5 2b a8 a0 3e 15 c9 b4 5c b5 95 cd 7a 80 30 7c 7a ac 45 7a f0 c2 9e 5b eb 37 c8 f5 7e df 5a 20 44 d4 91 da 13 18 bd 54 73 d1 42 76 09 07 79 a3 d4 bd b1 cf 2e 33 eb 77 46 03 7c a4 ce a2 90 91 32 ce 10 b2 7f ab 8f a2 97 af 00 00 00 81 00 f4 49 cb c9 51 4c 86 c8 e6 39 2c f1 98 9f 4a 7e c4 24 c9 28 98 dc e2 1d 9e cd 79 a6 ea 5e 96 57 2d c7 73 a2 41 41 d5 00 64 42 a0 e5 08 97 ec e5 c3 e6 6c aa 6c 55 67 ad f2 a9 b6 c0 d1 8d e4 26 09 3c fc e3 81 a8 a0 15 4e db 38 2e ff cb b2 7a 4f 87 84 22 1d e1 7b d5 7d a5 35 a2 fe e0 b4 5e 4e e3 7c 1d 83 ee 7b 6c 17 de 3c f6 eb f4 d4 84 cf fa 1f 25 68 24 36 fb f8 b4 68 bb 18 0f fb 6c 00 00 00 37 00 00 00 07 73 73 68 2d 64 73 73 00 00 00 28 0e 31 90 5b 0c 6e 52 4b 2a 1f ea 50 a8 c2 c3 eb 25 ba 33 23 81 86 f9 70 de fe 9b 5a d9 46 a2 03 87 e8 42 b0 90 b3 02 3f
2021-03-09 20:42:46,311 [reader] TRACE transport.TransportImpl  - Received packet KEXDH_31
2021-03-09 20:42:46,311 [reader] DEBUG transport.KeyExchanger  - Received kex followup data
2021-03-09 20:42:46,311 [reader] DEBUG kex.DHG1  - Received SSH_MSG_KEXDH_REPLY
2021-03-09 20:42:46,337 [reader] DEBUG transport.KeyExchanger  - Trying to verify host key with net.schmizz.sshj.transport.verification.PromiscuousVerifier@228aab19
2021-03-09 20:42:46,337 [reader] DEBUG transport.KeyExchanger  - Sending SSH_MSG_NEWKEYS
2021-03-09 20:42:46,337 [reader] TRACE transport.Encoder  - Encoding packet #1: 15
2021-03-09 20:42:46,353 [reader] TRACE transport.Decoder  - Received packet #2: 15
2021-03-09 20:42:46,353 [reader] TRACE transport.TransportImpl  - Received packet NEWKEYS
2021-03-09 20:42:46,353 [reader] DEBUG transport.KeyExchanger  - Received SSH_MSG_NEWKEYS
2021-03-09 20:42:46,359 [pool-InterpreterHandler_TELNET-thread-1] DEBUG sshj.SSHClient  - Key exchange took 0.595 seconds

Additional info: the SSH server is a bit odd and needs the flag '-c 3des-cbc' from the command line:

$ ssh -v xxxxxx@10.238.94.252
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips  26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug1: Connecting to 10.238.94.252 [10.238.94.252] port 22.
debug1: Connection established.
...
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
debug1: Remote protocol version 2.0, remote software version RomSShell_4.31
debug1: no match: RomSShell_4.31
debug1: Authenticating to 10.238.94.252:22 as 'xxxxxx'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: diffie-hellman-group1-sha1
debug1: kex: host key algorithm: ssh-dss
Unable to negotiate with 10.238.94.252 port 22: no matching cipher found. Their offer: 3des-cbc

I can run any test you need, but the server is an embedded one so I can't modify it.

Thanks!

hierynomus commented 3 years ago

Hi,

From what I see from the logging we receive a 01, meaning a DISCONNECT on the KEXDH_INIT message. Meaning the server you're connecting to didn't like the message of SSHJ 0.31

It would be useful to try to determine in which version between 0.18 and 0.31 this problem started, so that we can pinpoint the cause. Start with 0.24 and work either up or downwards from that using binary searching.

One problem I've found through googling is that libssh once contained a bug with regards to packet lengths and diffie-hellman-group1-sha1. You could try disabling that algorithm and the grou14 one in the SSHJ config and seeing whether that fixes it for 0.31 (source: https://security.stackexchange.com/questions/124767/what-could-cause-bad-packet-length-with-sshd)

Let me know whether you're either able to pinpoint the version from which this broke, or whether forcing another kex algorithm fixes it.

jmatias-assia commented 3 years ago

Ok - it works in 0.26 but fails in 0.27 - below are the details:

I'll try disabling the algorithms but that will take me more time.

Thanks!

Jorge.

jmatias-assia commented 3 years ago

Disabling the algorithms doesn't seem to work with this SSH server:

2021-03-10 19:43:35,636 [pool-InterpreterHandler_TELNET-thread-1] INFO  telnetproxy.SshClientConfig  - Getting algorithm for seeding
2021-03-10 19:43:35,637 [pool-InterpreterHandler_TELNET-thread-1] INFO  telnetproxy.SshClientConfig  - Generating seed
2021-03-10 19:43:35,637 [pool-InterpreterHandler_TELNET-thread-1] INFO  telnetproxy.SshClientConfig  - Seed generated
2021-03-10 19:43:35,787 [pool-InterpreterHandler_TELNET-thread-1] DEBUG sshj.DefaultConfig  - Available cipher factories: [aes128-cbc, aes128-ctr, aes192-cbc, aes192-ctr, aes256-cbc, aes256-ctr, aes128-gcm@openssh.com, aes256-gcm@openssh.com, blowfish
-cbc, blowfish-ctr, cast128-cbc, cast128-ctr, idea-cbc, idea-ctr, serpent128-cbc, serpent128-ctr, serpent192-cbc, serpent192-ctr, serpent256-cbc, serpent256-ctr, 3des-cbc, 3des-ctr, twofish128-cbc, twofish128-ctr, twofish192-cbc, twofish192-ctr, twofi
sh256-cbc, twofish256-ctr, twofish-cbc, arcfour, arcfour128, arcfour256]
2021-03-10 19:43:35,830 [pool-InterpreterHandler_TELNET-thread-1] INFO  telnetproxy.SshCommandProcessor  - Connecting to 'Address = 10.238.94.252:22'
2021-03-10 19:43:35,844 [pool-InterpreterHandler_TELNET-thread-1] INFO  transport.TransportImpl  - Client identity string: SSH-2.0-SSHJ_0.31.0
2021-03-10 19:43:35,875 [pool-InterpreterHandler_TELNET-thread-1] INFO  transport.TransportImpl  - Server identity string: SSH-2.0-RomSShell_4.31
2021-03-10 19:43:35,876 [pool-InterpreterHandler_TELNET-thread-1] DEBUG transport.KeyExchanger  - Sending SSH_MSG_KEXINIT
2021-03-10 19:43:35,880 [reader] TRACE transport.Decoder  - Received packet #0: 14 8b 28 a2 88 b6 f8 c6 e7 9d a6 a2 1f 71 c2 8e 52 00 00 00 1a 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 2d 73 68 61 31 00 00 00 07 73 73 68 2d 64 73
73 00 00 00 08 33 64 65 73 2d 63 62 63 00 00 00 08 33 64 65 73 2d 63 62 63 00 00 00 09 68 6d 61 63 2d 73 68 61 31 00 00 00 09 68 6d 61 63 2d 73 68 61 31 00 00 00 04 6e 6f 6e 65 00 00 00 04 6e 6f 6e 65 00 00 00 00 00 00 00 00 00 00 00 00 00
2021-03-10 19:43:35,887 [reader] TRACE transport.TransportImpl  - Received packet KEXINIT
2021-03-10 19:43:35,889 [reader] DEBUG transport.KeyExchanger  - Received SSH_MSG_KEXINIT
2021-03-10 19:43:35,890 [pool-InterpreterHandler_TELNET-thread-1] TRACE transport.Encoder  - Encoding packet #0: 14 d9 20 83 7e 57 20 be 7a b1 c5 f7 44 70 80 d9 5e 00 00 02 70 63 75 72 76 65 32 35 35 31 39 2d 73 68 61 32 35 36 2c 63 75 72 76 65 32 35
35 31 39 2d 73 68 61 32 35 36 40 6c 69 62 73 73 68 2e 6f 72 67 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 32 35 36 2c 65 63 64 68 2d 73 68 61 32 2d 6e 69 73 74 70 35 32 31 2c 65 63 64 68 2d 73
 68 61 32 2d 6e 69 73 74 70 33 38 34 2c 65 63 64 68 2d 73 68 61 32 2d 6e 69 73 74 70 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 31 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 7
2 6f 75 70 31 34 2d 73 68 61 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c
6c 6d 61 6e 2d 67 72 6f 75 70 31 37 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 38 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 34 2d 73 68 61 32 35 36 40 73 73 68 2e
 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 68 61 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 68 61 32 35 36 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6
d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 68 61 33 38 34 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 33
38 34 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 35 31 32 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 38 2d 73 68 61 35 31 32 40 73 73 68 2e 63
 6f 6d 2c 65 78 74 2d 69 6e 66 6f 2d 63 00 00 00 ab 73 73 68 2d 65 64 32 35 35 31 39 2c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 35 32 31 2c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 33 38 34 2c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 7
4 70 32 35 36 2c 72 73 61 2d 73 68 61 32 2d 35 31 32 2c 72 73 61 2d 73 68 61 32 2d 32 35 36 2c 73 73 68 2d 72 73 61 2d 63 65 72 74 2d 76 30 31 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 73 73 68 2d 64 73 73 2d 63 65 72 74 2d 76 30 31 40 6f 70 65 6e 73 73
68 2e 63 6f 6d 2c 73 73 68 2d 72 73 61 2c 73 73 68 2d 64 73 73 00 00 01 a3 61 65 73 31 32 38 2d 63 62 63 2c 61 65 73 31 32 38 2d 63 74 72 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 73 32 35 36 2d 63 62 63 2c 61 65 73 32
 35 36 2d 63 74 72 2c 61 65 73 31 32 38 2d 67 63 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 61 65 73 32 35 36 2d 67 63 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 62 6c 6f 77 66 69 73 68 2d 63 62 63 2c 62 6c 6f 77 66 69 73 68 2d 63 74 72 2c 63 61 73 74 3
1 32 38 2d 63 62 63 2c 63 61 73 74 31 32 38 2d 63 74 72 2c 69 64 65 61 2d 63 62 63 2c 69 64 65 61 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 62 63 2c 73
65 72 70 65 6e 74 31 39 32 2d 63 74 72 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 62 63 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 74 72 2c 33 64 65 73 2d 63 62 63 2c 33 64 65 73 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 62 63 2c 74 77 6f 66 69 73 68
 31 32 38 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 74 72 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 62 63 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 74 72 2c 74 77 6f 66 69 73 68 2d 63 62 63 2c 61 72 63 6
6 6f 75 72 2c 61 72 63 66 6f 75 72 31 32 38 2c 61 72 63 66 6f 75 72 32 35 36 00 00 01 a3 61 65 73 31 32 38 2d 63 62 63 2c 61 65 73 31 32 38 2d 63 74 72 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 73 32 35 36 2d 63 62 63
2c 61 65 73 32 35 36 2d 63 74 72 2c 61 65 73 31 32 38 2d 67 63 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 61 65 73 32 35 36 2d 67 63 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 62 6c 6f 77 66 69 73 68 2d 63 62 63 2c 62 6c 6f 77 66 69 73 68 2d 63 74 72 2c
 63 61 73 74 31 32 38 2d 63 62 63 2c 63 61 73 74 31 32 38 2d 63 74 72 2c 69 64 65 61 2d 63 62 63 2c 69 64 65 61 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 39 32 2d 6
3 62 63 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 74 72 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 62 63 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 74 72 2c 33 64 65 73 2d 63 62 63 2c 33 64 65 73 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 62 63 2c 74 77
6f 66 69 73 68 31 32 38 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 74 72 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 62 63 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 74 72 2c 74 77 6f 66 69 73 68 2d 63 62 63
 2c 61 72 63 66 6f 75 72 2c 61 72 63 66 6f 75 72 31 32 38 2c 61 72 63 66 6f 75 72 32 35 36 00 00 01 46 68 6d 61 63 2d 73 68 61 31 2c 68 6d 61 63 2d 73 68 61 31 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 2c 6
8 6d 61 63 2d 73 68 61 31 2d 39 36 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2c 68 6d 61 63 2d 6d 64 35 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2d 65
74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2c 68 6d 61 63 2d 73 68 61 32 2d 35
 31 32 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 39 36 2c 6
8 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 00 00 01 46 68 6d 61 63 2d 73 68 61 31 2c 68 6d 61 63 2d 73 68 61 31 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 2c 68 6d 61 63 2d
73 68 61 31 2d 39 36 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2c 68 6d 61 63 2d 6d 64 35 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2d 65 74 6d 40 6f 70
 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2d 65 7
4 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 39 36 2c 68 6d 61 63 2d
72 69 70 65 6d 64 31 36 30 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 00 00 00 04 6e 6f 6e 65 00 00 00 04 6e 6f 6e 65 00 00 00 00 00 00 00 00 00 00 00 00 00
2021-03-10 19:43:35,894 [reader] ERROR transport.TransportImpl  - Dying because - Unable to reach a settlement: [curve25519-sha256, curve25519-sha256@libssh.org, diffie-hellman-group-exchange-sha256, ecdh-sha2-nistp521, ecdh-sha2-nistp384, ecdh-sha2-nistp256, diffie-hellman-group-exchange-sha1, diffie-hellman-group14-sha256, diffie-hellman-group15-sha512, diffie-hellman-group16-sha512, diffie-hellman-group17-sha512, diffie-hellman-group18-sha512, diffie-hellman-group14-sha256@ssh.com, diffie-hellman-group15-sha256, diffie-hellman-group15-sha256@ssh.com, diffie-hellman-group15-sha384@ssh.com, diffie-hellman-group16-sha256, diffie-hellman-group16-sha384@ssh.com, diffie-hellman-group16-sha512@ssh.com, diffie-hellman-group18-sha512@ssh.com, ext-info-c] and [diffie-hellman-group1-sha1]
net.schmizz.sshj.transport.TransportException: Unable to reach a settlement: [curve25519-sha256, curve25519-sha256@libssh.org, diffie-hellman-group-exchange-sha256, ecdh-sha2-nistp521, ecdh-sha2-nistp384, ecdh-sha2-nistp256, diffie-hellman-group-exchange-sha1, diffie-hellman-group14-sha256, diffie-hellman-group15-sha512, diffie-hellman-group16-sha512, diffie-hellman-group17-sha512, diffie-hellman-group18-sha512, diffie-hellman-group14-sha256@ssh.com, diffie-hellman-group15-sha256, diffie-hellman-group15-sha256@ssh.com, diffie-hellman-group15-sha384@ssh.com, diffie-hellman-group16-sha256, diffie-hellman-group16-sha384@ssh.com, diffie-hellman-group16-sha512@ssh.com, diffie-hellman-group18-sha512@ssh.com, ext-info-c] and [diffie-hellman-group1-sha1]
        at net.schmizz.sshj.transport.Proposal.firstMatch(Proposal.java:149)
        at net.schmizz.sshj.transport.Proposal.negotiate(Proposal.java:130)
        at net.schmizz.sshj.transport.KeyExchanger.gotKexInit(KeyExchanger.java:222)
        at net.schmizz.sshj.transport.KeyExchanger.handle(KeyExchanger.java:370)
        at net.schmizz.sshj.transport.TransportImpl.handle(TransportImpl.java:517)
        at net.schmizz.sshj.transport.Decoder.decode(Decoder.java:113)
        at net.schmizz.sshj.transport.Decoder.received(Decoder.java:203)
        at net.schmizz.sshj.transport.Reader.run(Reader.java:60)
2021-03-10 19:43:35,900 [reader] INFO  transport.TransportImpl  - Disconnected - UNKNOWN
2021-03-10 19:43:35,902 [reader] DEBUG transport.KeyExchanger  - Got notified of net.schmizz.sshj.transport.TransportException: Unable to reach a settlement: [curve25519-sha256, curve25519-sha256@libssh.org, diffie-hellman-group-exchange-sha256, ecdh-sha2-nistp521, ecdh-sha2-nistp384, ecdh-sha2-nistp256, diffie-hellman-group-exchange-sha1, diffie-hellman-group14-sha256, diffie-hellman-group15-sha512, diffie-hellman-group16-sha512, diffie-hellman-group17-sha512, diffie-hellman-group18-sha512, diffie-hellman-group14-sha256@ssh.com, diffie-hellman-group15-sha256, diffie-hellman-group15-sha256@ssh.com, diffie-hellman-group15-sha384@ssh.com, diffie-hellman-group16-sha256, diffie-hellman-group16-sha384@ssh.com, diffie-hellman-group16-sha512@ssh.com, diffie-hellman-group18-sha512@ssh.com, ext-info-c] and [diffie-hellman-group1-sha1]
2021-03-10 19:43:35,902 [reader] DEBUG transport.TransportImpl$NullService  - Notified of net.schmizz.sshj.transport.TransportException: Unable to reach a settlement: [curve25519-sha256, curve25519-sha256@libssh.org, diffie-hellman-group-exchange-sha256, ecdh-sha2-nistp521, ecdh-sha2-nistp384, ecdh-sha2-nistp256, diffie-hellman-group-exchange-sha1, diffie-hellman-group14-sha256, diffie-hellman-group15-sha512, diffie-hellman-group16-sha512, diffie-hellman-group17-sha512, diffie-hellman-group18-sha512, diffie-hellman-group14-sha256@ssh.com, diffie-hellman-group15-sha256, diffie-hellman-group15-sha256@ssh.com, diffie-hellman-group15-sha384@ssh.com, diffie-hellman-group16-sha256, diffie-hellman-group16-sha384@ssh.com, diffie-hellman-group16-sha512@ssh.com, diffie-hellman-group18-sha512@ssh.com, ext-info-c] and [diffie-hellman-group1-sha1]
2021-03-10 19:43:35,902 [reader] DEBUG transport.TransportImpl  - Setting active service to null-service
2021-03-10 19:43:35,903 [reader] DEBUG transport.Reader  - Stopping

For your reference I did this in my configuration:

    private static final Set<String> DISABLED_GROUPS = Helper.unmodifiableSet(
            new DHG1.Factory().getName(),
            new DHG14.Factory().getName()
    );

    @Override
    public void setKeyExchangeFactories(Factory.Named<KeyExchange>... kexFactories) {
        ArrayList<Factory.Named<KeyExchange>> factories = new ArrayList<>();
        for (Named<KeyExchange> factory : kexFactories) {
            if (!DISABLED_GROUPS.contains(factory.getName())) {
                factories.add(factory);
            }
        }
        setKeyExchangeFactories(factories);
    }
hierynomus commented 3 years ago

Ok, so the server only supports the diffie-hellman-group1-sha1 kex algorithm

Does that exception happen consistently with 0.27? Because that's a different exception from what we're seeing with 0.31.

jmatias-assia commented 3 years ago

Because that's a different exception from what we're seeing with 0.31.

Ops, I hadn't realized about that ... I have retried again with 0.27 and now I'm getting the same exception than in 0.31:

2021-03-11 15:50:39,877 [pool-InterpreterHandler_TELNET-thread-2] INFO  telnetproxy.SshClientConfig  - Getting algorithm for seeding
2021-03-11 15:50:39,877 [pool-InterpreterHandler_TELNET-thread-2] INFO  telnetproxy.SshClientConfig  - Generating seed
2021-03-11 15:50:39,877 [pool-InterpreterHandler_TELNET-thread-2] INFO  telnetproxy.SshClientConfig  - Seed generated
2021-03-11 15:50:39,886 [pool-InterpreterHandler_TELNET-thread-2] DEBUG sshj.DefaultConfig  - Available cipher factories: [aes128-cbc, aes128-ctr, aes192-cbc, aes192-ctr, aes256-cbc, aes256-ctr, blowfish-cbc, blowfish-ctr, cast128-cbc, cast128-ctr, id
ea-cbc, idea-ctr, serpent128-cbc, serpent128-ctr, serpent192-cbc, serpent192-ctr, serpent256-cbc, serpent256-ctr, 3des-cbc, 3des-ctr, twofish128-cbc, twofish128-ctr, twofish192-cbc, twofish192-ctr, twofish256-cbc, twofish256-ctr, twofish-cbc, arcfour,
 arcfour128, arcfour256]
2021-03-11 15:50:39,886 [pool-InterpreterHandler_TELNET-thread-2] INFO  telnetproxy.SshCommandProcessor  - Connecting to 'Address = 10.238.94.252:22'
2021-03-11 15:50:39,896 [pool-InterpreterHandler_TELNET-thread-2] INFO  transport.TransportImpl  - Client identity string: SSH-2.0-SSHJ_0.27.0
2021-03-11 15:50:39,922 [pool-InterpreterHandler_TELNET-thread-2] INFO  transport.TransportImpl  - Server identity string: SSH-2.0-RomSShell_4.31
2021-03-11 15:50:39,922 [pool-InterpreterHandler_TELNET-thread-2] DEBUG transport.KeyExchanger  - Sending SSH_MSG_KEXINIT
2021-03-11 15:50:39,922 [reader] TRACE transport.Decoder  - Received packet #0: 14 7b 27 7a 1a c7 83 24 45 26 06 2f ef c7 13 ad 3e 00 00 00 1a 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 2d 73 68 61 31 00 00 00 07 73 73 68 2d 64 73
73 00 00 00 08 33 64 65 73 2d 63 62 63 00 00 00 08 33 64 65 73 2d 63 62 63 00 00 00 09 68 6d 61 63 2d 73 68 61 31 00 00 00 09 68 6d 61 63 2d 73 68 61 31 00 00 00 04 6e 6f 6e 65 00 00 00 04 6e 6f 6e 65 00 00 00 00 00 00 00 00 00 00 00 00 00
2021-03-11 15:50:39,923 [reader] TRACE transport.TransportImpl  - Received packet KEXINIT
2021-03-11 15:50:39,923 [reader] DEBUG transport.KeyExchanger  - Received SSH_MSG_KEXINIT
2021-03-11 15:50:39,923 [pool-InterpreterHandler_TELNET-thread-2] TRACE transport.Encoder  - Encoding packet #0: 14 6e 54 de 12 94 30 98 0a af a4 3e 3f b1 a1 04 7b 00 00 02 9c 63 75 72 76 65 32 35 35 31 39 2d 73 68 61 32 35 36 2c 63 75 72 76 65 32 35
35 31 39 2d 73 68 61 32 35 36 40 6c 69 62 73 73 68 2e 6f 72 67 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 32 35 36 2c 65 63 64 68 2d 73 68 61 32 2d 6e 69 73 74 70 35 32 31 2c 65 63 64 68 2d 73
 68 61 32 2d 6e 69 73 74 70 33 38 34 2c 65 63 64 68 2d 73 68 61 32 2d 6e 69 73 74 70 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 31 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 7
2 6f 75 70 31 2d 73 68 61 31 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 34 2d 73 68 61 31 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 34 2d 73 68 61 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d
67 72 6f 75 70 31 35 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 37 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65
 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 38 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 34 2d 73 68 61 32 35 36 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 6
8 61 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 68 61 32 35 36 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 68 61 33 38 34 40 73 73 68 2e 63 6f 6d 2c 64 69
66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 33 38 34 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 35 31 32 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 38 2d 73 68 61 35 31 32 40 73 73 68 2e 63 6f 6d 00 00 00 57 73 73 68 2d 65 64 32 35 35 31 39 2c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 32 35 36 2c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 33 38 34 2c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 35 32 31 2c 73 73 68 2d 72 73 61 2c 73 73 68 2d 64 73 73 00 00 01 75 61 65 73 31 32 38 2d 63 62 63 2c 61 65 73 31 32 38 2d 63 74 72 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 73 32 35 36 2d 63 62 63 2c 61 65 73 32 35 36 2d 63 74 72 2c 62 6c 6f 77 66 69 73 68 2d 63 62 63 2c 62 6c 6f 77 66 69 73 68 2d 63 74 72 2c 63 61 73 74 31 32 38 2d 63 62 63 2c 63 61 73 74 31 32 38 2d 63 74 72 2c 69 64 65 61 2d 63 62 63 2c 69 64 65 61 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 74 72 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 62 63 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 74 72 2c 33 64 65 73 2d 63 62 63 2c 33 64 65 73 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 74 72 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 62 63 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 74 72 2c 74 77 6f 66 69 73 68 2d 63 62 63 2c 61 72 63 66 6f 75 72 2c 61 72 63 66 6f 75 72 31 32 38 2c 61 72 63 66 6f 75 72 32 35 36 00 00 01 75 61 65 73 31 32 38 2d 63 62 63 2c 61 65 73 31 32 38 2d 63 74 72 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 73 32 35 36 2d 63 62 63 2c 61 65 73 32 35 36 2d 63 74 72 2c 62 6c 6f 77 66 69 73 68 2d 63 62 63 2c 62 6c 6f 77 66 69 73 68 2d 63 74 72 2c 63 61 73 74 31 32 38 2d 63 62 63 2c 63 61 73 74 31 32 38 2d 63 74 72 2c 69 64 65 61 2d 63 62 63 2c 69 64 65 61 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 74 72 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 62 63 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 74 72 2c 33 64 65 73 2d 63 62 63 2c 33 64 65 73 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 74 72 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 62 63 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 74 72 2c 74 77 6f 66 69 73 68 2d 63 62 63 2c 61 72 63 66 6f 75 72 2c 61 72 63 66 6f 75 72 31 32 38 2c 61 72 63 66 6f 75 72 32 35 36 00 00 01 46 68 6d 61 63 2d 73 68 61 31 2c 68 6d 61 63 2d 73 68 61 31 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2c 68 6d 61 63 2d 6d 64 35 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 39 36 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 00 00 01 46 68 6d 61 63 2d 73 68 61 31 2c 68 6d 61 63 2d 73 68 61 31 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2c 68 6d 61 63 2d 6d 64 35 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 39 36 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 00 00 00 04 6e 6f 6e 65 00 00 00 04 6e 6f 6e 65 00 00 00 00 00 00 00 00 00 00 00 00 00
2021-03-11 15:50:39,924 [reader] DEBUG transport.KeyExchanger  - Negotiated algorithms: [ kex=diffie-hellman-group1-sha1; sig=ssh-dss; c2sCipher=3des-cbc; s2cCipher=3des-cbc; c2sMAC=hmac-sha1; s2cMAC=hmac-sha1; c2sComp=none; s2cComp=none ]
2021-03-11 15:50:39,928 [reader] TRACE transport.Encoder  - Encoding packet #1: 1e 00 00 00 80 43 41 0c 2e 8b 3e 3b 90 b6 a4 80 7c 0f 13 de 0d d7 79 e0 44 bf fd 06 4c 1c 02 e6 8f 40 73 a5 79 09 17 8f 8c e8 1a 3a 2d 59 4f a0 8c e3 e4 26 f8 f7 84 54 98 6b 72 ac 09 0a 7e 43 15 63 13 e8 af 5a ae d8 d0 7f 46 41 de 5f 27 d4 30 cc a0 6c a2 6d 9e b7 48 73 52 80 45 50 92 08 7a 91 7f 57 52 43 06 35 2c f3 e3 7b 3d 1e a8 2b d2 4d 51 45 f1 be 15 52 8a 47 b8 2d 9c b7 cc 04 4c 9c 31 36 d1
2021-03-11 15:50:39,942 [reader] TRACE transport.Decoder  - Received packet #1: 01 00 00 00 02 00 00 00 11 42 61 64 20 70 61 63 6b 65 74 20 6c 65 6e 67 74 68 00 00 00 00
2021-03-11 15:50:39,942 [reader] TRACE transport.TransportImpl  - Received packet DISCONNECT
2021-03-11 15:50:39,942 [reader] INFO  transport.TransportImpl  - Received SSH_MSG_DISCONNECT (reason=PROTOCOL_ERROR, msg=Bad packet length)
2021-03-11 15:50:39,943 [reader] ERROR transport.TransportImpl  - Dying because - Bad packet length
net.schmizz.sshj.transport.TransportException: [PROTOCOL_ERROR] Bad packet length
        at net.schmizz.sshj.transport.TransportImpl.gotDisconnect(TransportImpl.java:548)
        at net.schmizz.sshj.transport.TransportImpl.handle(TransportImpl.java:508)
        at net.schmizz.sshj.transport.Decoder.decodeMte(Decoder.java:159)
        at net.schmizz.sshj.transport.Decoder.decode(Decoder.java:79)
        at net.schmizz.sshj.transport.Decoder.received(Decoder.java:231)
        at net.schmizz.sshj.transport.Reader.run(Reader.java:59)
2021-03-11 15:50:39,943 [reader] INFO  transport.TransportImpl  - Disconnected - PROTOCOL_ERROR
2021-03-11 15:50:39,943 [reader] DEBUG transport.KeyExchanger  - Got notified of net.schmizz.sshj.transport.TransportException: [PROTOCOL_ERROR] Bad packet length
2021-03-11 15:50:39,943 [reader] DEBUG transport.TransportImpl$NullService  - Notified of net.schmizz.sshj.transport.TransportException: [PROTOCOL_ERROR] Bad packet length
hierynomus commented 3 years ago

Does it work consistently with 0.26 and consistently not with 0.27?

jmatias-assia commented 3 years ago

Yep ... it works always with 0.26 0-

If it helps, I downloaded the jars from https://repo1.maven.org/maven2/com/hierynomus/sshj/

hierynomus commented 3 years ago

Ok, great and 0.27 consistently fails?

jmatias-assia commented 3 years ago

Yes, I have tried more times with 0.27 and it always fails with protocol error - I haven't been able to repeat the 'unknown' issue

hierynomus commented 3 years ago

Ok, I think I've narrowed it down to coming from the Encoder class. That was changed between 0.26 and 0.27 to add support for ETM ciphers. The way the padding length is calculated has changed. Probably it ends up in some corner case which fails to set the correct length for the outgoing packet, leading to the server to drop the connection with the "Bad Packet Length" reason.

amartya10 commented 6 months ago

Hello Team I am also getting similar issue

SSH Server : SSH-2.0-RomSShell_4.61
Client : SSH-2.0-SSHJ_0.32.0 and SSH-2.0-SSHJ_0.36.0

We tried using sshj v0.32 and v0.36 but still get same issue

INFO    : Client identity string: SSH-2.0-SSHJ_0.32.0
--
INFO    : Server identity string: SSH-2.0-RomSShell_4.61
DEBUG   : Setting <<kex done>> to `null`
DEBUG   : Sending SSH_MSG_KEXINIT
TRACE   : Encoding packet #0: 14 b1 3d a1 cf e5 08 73 8f be 60 b6 03 0f 01 e8 7b 00 00 02 a7 63 75 72 76 65 32 35 35 31 39 2d 73 68 61 32 35 36 2c 63 75 72 76 65 32 35 35 31 39 2d 73 68 61 32 35 36 40 6c 69 62 73 73 68 2e 6f 72 67 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 32 35 36 2c 65 63 64 68 2d 73 68 61 32 2d 6e 69 73 74 70 35 32 31 2c 65 63 64 68 2d 73 68 61 32 2d 6e 69 73 74 70 33 38 34 2c 65 63 64 68 2d 73 68 61 32 2d 6e 69 73 74 70 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 31 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 2d 73 68 61 31 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 34 2d 73 68 61 31 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 34 2d 73 68 61 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 37 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 38 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 34 2d 73 68 61 32 35 36 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 68 61 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 68 61 32 35 36 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 68 61 33 38 34 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 33 38 34 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 35 31 32 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 38 2d 73 68 61 35 31 32 40 73 73 68 2e 63 6f 6d 2c 65 78 74 2d 69 6e 66 6f 2d 63 00 00 01 47 73 73 68 2d 65 64 32 35 35 31 39 2d 63 65 72 74 2d 76 30 31 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 73 73 68 2d 65 64 32 35 35 31 39 2c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 35 32 31 2d 63 65 72 74 2d 76 30 31 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 35 32 31 2c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 33 38 34 2d 63 65 72 74 2d 76 30 31 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 33 38 34 2c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 32 35 36 2d 63 65 72 74 2d 76 30 31 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 32 35 36 2c 72 73 61 2d 73 68 61 32 2d 35 31 32 2c 72 73 61 2d 73 68 61 32 2d 32 35 36 2c 73 73 68 2d 72 73 61 2d 63 65 72 74 2d 76 30 31 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 73 73 68 2d 64 73 73 2d 63 65 72 74 2d 76 30 31 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 73 73 68 2d 72 73 61 2c 73 73 68 2d 64 73 73 00 00 01 c1 63 68 61 63 68 61 32 30 2d 70 6f 6c 79 31 33 30 35 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 61 65 73 31 32 38 2d 63 62 63 2c 61 65 73 31 32 38 2d 63 74 72 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 73 32 35 36 2d 63 62 63 2c 61 65 73 32 35 36 2d 63 74 72 2c 61 65 73 31 32 38 2d 67 63 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 61 65 73 32 35 36 2d 67 63 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 62 6c 6f 77 66 69 73 68 2d 63 62 63 2c 62 6c 6f 77 66 69 73 68 2d 63 74 72 2c 63 61 73 74 31 32 38 2d 63 62 63 2c 63 61 73 74 31 32 38 2d 63 74 72 2c 69 64 65 61 2d 63 62 63 2c 69 64 65 61 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 74 72 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 62 63 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 74 72 2c 33 64 65 73 2d 63 62 63 2c 33 64 65 73 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 74 72 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 62 63 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 74 72 2c 74 77 6f 66 69 73 68 2d 63 62 63 2c 61 72 63 66 6f 75 72 2c 61 72 63 66 6f 75 72 31 32 38 2c 61 72 63 66 6f 75 72 32 35 36 00 00 01 c1 63 68 61 63 68 61 32 30 2d 70 6f 6c 79 31 33 30 35 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 61 65 73 31 32 38 2d 63 62 63 2c 61 65 73 31 32 38 2d 63 74 72 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 73 32 35 36 2d 63 62 63 2c 61 65 73 32 35 36 2d 63 74 72 2c 61 65 73 31 32 38 2d 67 63 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 61 65 73 32 35 36 2d 67 63 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 62 6c 6f 77 66 69 73 68 2d 63 62 63 2c 62 6c 6f 77 66 69 73 68 2d 63 74 72 2c 63 61 73 74 31 32 38 2d 63 62 63 2c 63 61 73 74 31 32 38 2d 63 74 72 2c 69 64 65 61 2d 63 62 63 2c 69 64 65 61 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 74 72 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 62 63 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 74 72 2c 33 64 65 73 2d 63 62 63 2c 33 64 65 73 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 74 72 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 62 63 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 74 72 2c 74 77 6f 66 69 73 68 2d 63 62 63 2c 61 72 63 66 6f 75 72 2c 61 72 63 66 6f 75 72 31 32 38 2c 61 72 63 66 6f 75 72 32 35 36 00 00 01 46 68 6d 61 63 2d 73 68 61 31 2c 68 6d 61 63 2d 73 68 61 31 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2c 68 6d 61 63 2d 6d 64 35 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 39 36 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 00 00 01 46 68 6d 61 63 2d 73 68 61 31 2c 68 6d 61 63 2d 73 68 61 31 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2c 68 6d 61 63 2d 6d 64 35 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 39 36 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 00 00 00 04 6e 6f 6e 65 00 00 00 04 6e 6f 6e 65 00 00 00 00 00 00 00 00 00 00 00 00 00
DEBUG   : Setting <<kexinit sent>> to `SOME`
DEBUG   : Awaiting <<kex done>>
TRACE   : Received packet #0: 14 a5 fb 61 7c 82 d6 c0 db 0a 3b 33 48 d3 ed bb 5e 00 00 00 36 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 34 2d 73 68 61 31 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 2d 73 68 61 31 00 00 00 07 73 73 68 2d 72 73 61 00 00 00 29 61 65 73 32 35 36 2d 63 62 63 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 65 73 31 32 38 2d 63 62 63 2c 33 64 65 73 2d 63 62 63 00 00 00 29 61 65 73 32 35 36 2d 63 62 63 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 65 73 31 32 38 2d 63 62 63 2c 33 64 65 73 2d 63 62 63 00 00 00 09 68 6d 61 63 2d 73 68 61 31 00 00 00 09 68 6d 61 63 2d 73 68 61 31 00 00 00 04 6e 6f 6e 65 00 00 00 04 6e 6f 6e 65 00 00 00 00 00 00 00 00 00 00 00 00 00
TRACE   : Received packet KEXINIT
DEBUG   : Received SSH_MSG_KEXINIT
DEBUG   : Negotiated algorithms: [ kex=diffie-hellman-group1-sha1; sig=ssh-rsa; c2sCipher=aes128-cbc; s2cCipher=aes128-cbc; c2sMAC=hmac-sha1; s2cMAC=hmac-sha1; c2sComp=none; s2cComp=none; rsaSHA2Support=false ]
DEBUG   : Trying to verify algorithms with Script161$2@78560fe
TRACE   : Encoding packet #1: 1e 00 00 00 81 00 80 88 6e 6e ca bf a0 32 e4 af 36 4d 56 1d 9a 60 08 64 48 de e5 9d 3f 70 f3 b7 d8 cc 1f 46 e3 91 68 4e e0 c6 42 58 10 69 75 1e 95 cb cd 41 99 2d 15 dc 90 bd a5 58 e0 57 37 8b 43 d3 ee 45 29 31 5d 9a 2e 7a 0a 27 c2 07 2d c9 cc 8c 8b 6a fb be 1a 5a 6a 70 7b e0 90 3c 63 8b ad b4 4e 14 06 4b 1d 98 92 24 1d c6 7a 58 3f 2e 5c 8b 0f 83 ca bf 45 0e 25 76 95 dd a9 dd ad a2 76 61 de fc 27 1f
TRACE   : Received packet #1: 01 00 00 00 02 00 00 00 11 42 61 64 20 70 61 63 6b 65 74 20 6c 65 6e 67 74 68 00 00 00 00
TRACE   : Received packet DISCONNECT
INFO    : Received SSH_MSG_DISCONNECT (reason=PROTOCOL_ERROR, msg=Bad packet length)
ERROR   : Dying because - Bad packet length
INFO    : Disconnected - PROTOCOL_ERROR
DEBUG   : Got notified of net.schmizz.sshj.transport.TransportException: [PROTOCOL_ERROR] Bad packet length
DEBUG   : Notified of net.schmizz.sshj.transport.TransportException: [PROTOCOL_ERROR] Bad packet length
DEBUG   : Setting active service to null-service
ERROR   : <<kex done>> woke to: net.schmizz.sshj.transport.TransportException: [PROTOCOL_ERROR] Bad packet length
DEBUG   : Setting <<transport close>> to `SOME`
DEBUG   : Stopping

please anybody can help on this issue

Thanks