Socket error: disconnected, Socket error: No error

[Yanis Kurganov <yanis.kurganov@xxxxxxxxx>]

Hi!

I got a strange libssh error.

if (ssh_userauth_none(m_Session, nullptr) != SSH_AUTH_SUCCESS)
{
if (ssh_userauth_password(m_Session, nullptr, m_Settings->Password().c_str())
!= SSH_AUTH_SUCCESS)
  {
      while ((code = ssh_userauth_kbdint(m_Session, nullptr, nullptr)) ==
SSH_AUTH_INFO)
      .....
  }
}

ssh_connect: libssh 0.7.5 (c) 2003-2014 Aris Adamantiadis, Andreas
Schneider, and libssh contributors. Distributed under the LGPL, please
refer to COPYING file for information about your rights, using threading
threads_noop
getai: host 10.67.41.242 matches an IP address
ssh_socket_connect: Nonblocking connection socket: 1336
ssh_connect: Socket connecting, now waiting for the callbacks to work
ssh_connect: Actual timeout : 60000
ssh_socket_pollcallback: Received POLLOUT in connecting state
socket_callback_connected: Socket connection callback: 1 (0)
callback_receive_banner: Received banner:
SSH-2.0-OpenSSH_7.3p1+sftpfilecontrol-v1.3-hpn14v11
ssh_client_connection_callback: SSH server banner:
SSH-2.0-OpenSSH_7.3p1+sftpfilecontrol-v1.3-hpn14v11
ssh_analyze_banner: Analyzing banner:
SSH-2.0-OpenSSH_7.3p1+sftpfilecontrol-v1.3-hpn14v11
ssh_analyze_banner: We are talking to an OpenSSH client version: 7.3 (70300)
ssh_socket_unbuffered_write: Enabling POLLOUT for socket
ssh_packet_socket_callback: packet: read type 20
[len=988,padding=4,comp=983,payload=983]
ssh_packet_process: Dispatching handler for packet type 20
ssh_list_kex: kex algos: curve25519-sha256@xxxxxxxxxx
,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1
ssh_list_kex: server host key algo:
ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
ssh_list_kex: encryption client->server:
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
ssh_list_kex: encryption server->client:
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
ssh_list_kex: mac algo client->server: umac-64-etm@xxxxxxxxxxx,
umac-128-etm@xxxxxxxxxxx,hmac-sha2-256-etm@xxxxxxxxxxx,
hmac-sha2-512-etm@xxxxxxxxxxx,hmac-sha1-etm@xxxxxxxxxxx,umac-64@xxxxxxxxxxx,
umac-128@xxxxxxxxxxx,hmac-sha2-256,hmac-sha2-512,hmac-sha1
ssh_list_kex: mac algo server->client: umac-64-etm@xxxxxxxxxxx,
umac-128-etm@xxxxxxxxxxx,hmac-sha2-256-etm@xxxxxxxxxxx,
hmac-sha2-512-etm@xxxxxxxxxxx,hmac-sha1-etm@xxxxxxxxxxx,umac-64@xxxxxxxxxxx,
umac-128@xxxxxxxxxxx,hmac-sha2-256,hmac-sha2-512,hmac-sha1
ssh_list_kex: compression algo client->server: none,zlib@xxxxxxxxxxx
ssh_list_kex: compression algo server->client: none,zlib@xxxxxxxxxxx
ssh_list_kex: languages client->server:
ssh_list_kex: languages server->client:
ssh_list_kex: kex algos: curve25519-sha256@xxxxxxxxxx
,ecdh-sha2-nistp256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
ssh_list_kex: server host key algo:
ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-rsa,ssh-dss
ssh_list_kex: encryption client->server:
aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,blowfish-cbc,3des-cbc
ssh_list_kex: encryption server->client:
aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,blowfish-cbc,3des-cbc
ssh_list_kex: mac algo client->server: hmac-sha2-256,hmac-sha2-512,hmac-sha1
ssh_list_kex: mac algo server->client: hmac-sha2-256,hmac-sha2-512,hmac-sha1
ssh_list_kex: compression algo client->server: none
ssh_list_kex: compression algo server->client: none
ssh_list_kex: languages client->server:
ssh_list_kex: languages server->client:
ssh_socket_unbuffered_write: Enabling POLLOUT for socket
packet_send2: packet: wrote [len=588,padding=8,comp=579,payload=579]
packet_send2: packet: wrote [len=44,padding=6,comp=37,payload=37]
ssh_socket_unbuffered_write: Enabling POLLOUT for socket
ssh_packet_socket_callback: packet: read type 31
[len=188,padding=8,comp=179,payload=179]
ssh_packet_process: Dispatching handler for packet type 31
ssh_packet_dh_reply: Received SSH_MSG_KEXDH_REPLY
ssh_socket_unbuffered_write: Enabling POLLOUT for socket
packet_send2: packet: wrote [len=12,padding=10,comp=1,payload=1]
ssh_client_curve25519_reply: SSH_MSG_NEWKEYS sent
ssh_packet_socket_callback: Processing 16 bytes left in socket buffer
ssh_packet_socket_callback: packet: read type 21
[len=12,padding=10,comp=1,payload=1]
ssh_packet_process: Dispatching handler for packet type 21
ssh_packet_newkeys: Received SSH_MSG_NEWKEYS
crypt_set_algorithms2: Set output algorithm to aes256-ctr
crypt_set_algorithms2: Set HMAC output algorithm to hmac-sha2-256
crypt_set_algorithms2: Set input algorithm to aes256-ctr
crypt_set_algorithms2: Set HMAC output algorithm to hmac-sha2-256
ssh_pki_signature_verify_blob: Going to verify a ssh-ed25519 type signature
ssh_packet_newkeys: Signature verified and valid
ssh_connect: current state : 7
packet_send2: packet: wrote [len=28,padding=10,comp=17,payload=17]
ssh_service_request: Sent SSH_MSG_SERVICE_REQUEST (service ssh-userauth)
ssh_socket_unbuffered_write: Enabling POLLOUT for socket
ssh_packet_socket_callback: packet: read type 6
[len=28,padding=10,comp=17,payload=17]
ssh_packet_process: Dispatching handler for packet type 6
ssh_packet_service_accept: Received SSH_MSG_SERVICE_ACCEPT
ssh_socket_unbuffered_write: Enabling POLLOUT for socket
packet_send2: packet: wrote [len=44,padding=8,comp=35,payload=35]
ssh_packet_socket_callback: packet: read type 51
[len=60,padding=14,comp=45,payload=45]
ssh_packet_process: Dispatching handler for packet type 51
ssh_packet_userauth_failure: Access denied. Authentication that can
continue: publickey,password,keyboard-interactive
ssh_packet_userauth_failure: Access denied. Authentication that can
continue: publickey,password,keyboard-interactive
ssh_socket_unbuffered_write: Enabling POLLOUT for socket
packet_send2: packet: wrote [len=60,padding=7,comp=52,payload=52]
ssh_socket_exception_callback: Socket exception callback: 1 (0)
ssh_socket_exception_callback: Socket error: disconnected
ssh_userauth_kbdint_init: Sending keyboard-interactive init request
ssh_socket_exception_callback: Socket exception callback: 2 (0)
ssh_socket_exception_callback: Socket error: No error
packet_send2: packet: wrote [len=76,padding=16,comp=59,payload=59]

"Socket error: disconnected" - stable reproduction.
"Socket error: No error" - what does this mean?

Regards,
Yanis.