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From "Yuefeng (Jira)" <j...@apache.org>
Subject [jira] [Created] (SSHD-969) compatibility problem with cisco-2.0 ssh on ios-xr
Date Wed, 26 Feb 2020 01:36:00 GMT
Yuefeng created SSHD-969:
----------------------------

             Summary: compatibility problem with cisco-2.0 ssh on ios-xr 
                 Key: SSHD-969
                 URL: https://issues.apache.org/jira/browse/SSHD-969
             Project: MINA SSHD
          Issue Type: Bug
            Reporter: Yuefeng


When mina ssh library is used to connect with a Cisco IOS-XR device, the connection is consistently
reset by IOS-XR, here's mina log

 

 
{code:java}
2020-02-25 20:12:15.531Z [sshd-SshClient[468ca10d]-nio2-thread-1] DEBUG o.a.s.c.session.ClientSessionImpl:271
- initializeProxyConnector(ClientSessionImpl[null@/10.90.10.193:22]) no proxy to initialize
2020-02-25 20:12:15.531Z [pool-171-thread-1] INFO  com.forwardnetworks.client.a.f.a.d:20 -
Connected to 'xrv9k'
2020-02-25 20:12:15.531Z [pool-171-thread-1] DEBUG o.a.s.c.session.ClientSessionImpl:204 -
addPasswordIdentity(ClientSessionImpl[*****@/10.90.10.193:22]) SHA256:******
2020-02-25 20:12:15.532Z [pool-171-thread-1] INFO  com.forwardnetworks.client.a.f.a.d:28 -
Authenticating client session to xrv9k for up to 10000 seconds.
2020-02-25 20:12:15.532Z [pool-171-thread-1] DEBUG o.a.s.c.s.ClientUserAuthService:162 - auth(ClientSessionImpl[cisco@/10.90.10.193:22])[ssh-connection]
send SSH_MSG_USERAUTH_REQUEST for 'none'
2020-02-25 20:12:15.532Z [pool-171-thread-1] DEBUG o.a.s.c.session.ClientSessionImpl:808 -
writePacket(ClientSessionImpl[cisco@/10.90.10.193:22])[SSH_MSG_USERAUTH_REQUEST] Start flagging
packets as pending until key exchange is done
2020-02-25 20:12:15.533Z [sshd-SshClient[468ca10d]-nio2-thread-5] DEBUG o.a.s.c.session.ClientSessionImpl:167
- signalAuthFailure(ClientSessionImpl[cisco@/10.90.10.193:22]) type=IOException, signalled=true:
Connection reset by peer
{code}
 

Ssh (openssh) successfully connects to the save device
{code:java}
fwd-collector@collector:/usr/local/fwd/logs$ ssh -vvv ****@10.90.10.193
OpenSSH_7.2p2 Ubuntu-4ubuntu2.7, OpenSSL 1.0.2g 1 Mar 2016
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "10.90.10.193" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 10.90.10.193 [10.90.10.193] port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /home/fwd-collector/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/fwd-collector/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/fwd-collector/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/fwd-collector/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/fwd-collector/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/fwd-collector/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/fwd-collector/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/fwd-collector/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.7
debug1: Remote protocol version 2.0, remote software version Cisco-2.0
debug1: no match: Cisco-2.0
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to 10.90.10.193:22 as 'admin'
debug3: hostkeys_foreach: reading file "/home/fwd-collector/.ssh/known_hosts"
debug3: record_hostkey: found key type RSA in file /home/fwd-collector/.ssh/known_hosts:28
debug3: load_hostkeys: loaded 1 keys from 10.90.10.193
debug3: order_hostkeyalgs: prefer hostkeyalgs: ssh-rsa-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: ssh-rsa-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@openssh.com,zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group14-sha1
debug2: host key algorithms: ssh-rsa
debug2: ciphers ctos: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: MACs ctos: hmac-sha2-512,hmac-sha2-256,hmac-sha1
debug2: MACs stoc: hmac-sha2-512,hmac-sha2-256,hmac-sha1
debug2: compression ctos: none
debug2: compression stoc: none
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: ecdh-sha2-nistp256
debug1: kex: host key algorithm: ssh-rsa
debug1: kex: server->client cipher: aes128-ctr MAC: hmac-sha2-256 compression: none
debug1: kex: client->server cipher: aes128-ctr MAC: hmac-sha2-256 compression: none
debug3: send packet: type 30
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ssh-rsa SHA256:lja7613FGu9mq/VD7ArGz4zFA4xsRqxAIPuls7yr8GU
debug3: hostkeys_foreach: reading file "/home/fwd-collector/.ssh/known_hosts"
debug3: record_hostkey: found key type RSA in file /home/fwd-collector/.ssh/known_hosts:28
debug3: load_hostkeys: loaded 1 keys from 10.90.10.193
debug1: Host '10.90.10.193' is known and matches the RSA host key.
debug1: Found key in /home/fwd-collector/.ssh/known_hosts:28
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 4294967296 blocks
debug2: key: /home/fwd-collector/.ssh/id_rsa ((nil))
debug2: key: /home/fwd-collector/.ssh/id_dsa ((nil))
debug2: key: /home/fwd-collector/.ssh/id_ecdsa ((nil))
debug2: key: /home/fwd-collector/.ssh/id_ed25519 ((nil))
debug3: send packet: type 5
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: keyboard-interactive,password
debug3: start over, passed a different list keyboard-interactive,password
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup keyboard-interactive
debug3: remaining preferred: password
debug3: authmethod_is_enabled keyboard-interactive
debug1: Next authentication method: keyboard-interactive
debug2: userauth_kbdint
debug3: send packet: type 50
debug2: we sent a keyboard-interactive packet, wait for reply
debug3: receive packet: type 60
debug2: input_userauth_info_req
debug2: input_userauth_info_req: num_prompts 1
Password:
{code}
I noticed that Mina SSH sends msg 50 (SSH_MSG_USERAUTH_REQUEST) before key exchange completes
(IOS-XR sends reset immediately after).

With openssh, msg 50 is sent after key exchange and msg (5, 6).

 



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