Synology SSH Debugging

SSH-Debug-Client.txt

[client@client-TP-Arch .ssh]$ ssh -vvv admin@<server IP>
OpenSSH_7.3p1, OpenSSL 1.0.2h  3 May 2016
debug1: Reading configuration data /etc/ssh/ssh_config
debug2: resolving "<server IP>" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to <server IP> [<server IP>] port 22.
debug1: Connection established.
debug1: identity file /home/client/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /home/client/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/client/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/client/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/client/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/client/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/client/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/client/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.3
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.8p1-hpn14v6
debug1: match: OpenSSH_6.8p1-hpn14v6 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to <server IP>:22 as 'admin'
debug3: hostkeys_foreach: reading file "/home/client/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/client/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from <server IP>
debug3: order_hostkeyalgs: prefer hostkeyalgs: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
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-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
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: curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521
debug2: host key algorithms: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: aes128-ctr,aes128-gcm@openssh.com,aes192-ctr,aes256-ctr,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com
debug2: ciphers stoc: aes128-ctr,aes128-gcm@openssh.com,aes192-ctr,aes256-ctr,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com
debug2: MACs ctos: hmac-sha1,hmac-sha1-etm@openssh.com,hmac-sha2-256,hmac-sha2-256-etm@openssh.com,hmac-sha2-512,hmac-sha2-512-etm@openssh.com,umac-128-etm@openssh.com,umac-128@openssh.com,umac-64-etm@openssh.com,umac-64@openssh.com
debug2: MACs stoc: hmac-sha1,hmac-sha1-etm@openssh.com,hmac-sha2-256,hmac-sha2-256-etm@openssh.com,hmac-sha2-512,hmac-sha2-512-etm@openssh.com,umac-128-etm@openssh.com,umac-128@openssh.com,umac-64-etm@openssh.com,umac-64@openssh.com
debug2: compression ctos: none,zlib@openssh.com
debug2: compression stoc: none,zlib@openssh.com
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug1: kex: algorithm: curve25519-sha256@libssh.org
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:1GXi***
debug3: hostkeys_foreach: reading file "/home/client/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/client/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from <server IP>
debug1: Host '<server IP>' is known and matches the ECDSA host key.
debug1: Found key in /home/client/.ssh/known_hosts:1
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS received
debug2: key: /home/client/.ssh/id_rsa (0x55e7ba68b200), agent
debug2: key: /home/client/.ssh/id_dsa ((nil))
debug2: key: /home/client/.ssh/id_ecdsa ((nil))
debug2: key: /home/client/.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: publickey,password
debug3: start over, passed a different list publickey,password
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/client/.ssh/id_rsa
debug3: send_pubkey_test
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug2: input_userauth_pk_ok: fp SHA256:Kq+m***
debug3: sign_and_send_pubkey: RSA SHA256:Kq+m***
sign_and_send_pubkey: signing failed: agent refused operation
debug1: Trying private key: /home/client/.ssh/id_dsa
debug3: no such identity: /home/client/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /home/client/.ssh/id_ecdsa
debug3: no such identity: /home/client/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /home/client/.ssh/id_ed25519
debug3: no such identity: /home/client/.ssh/id_ed25519: No such file or directory
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
admin@<server IP>'s password: 
debug3: send packet: type 50
debug2: we sent a password packet, wait for reply
debug3: receive packet: type 52
debug1: Authentication succeeded (password).
Authenticated to <server IP> ([<server IP>]:22).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Requesting no-more-sessions@openssh.com
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: network
debug3: receive packet: type 80
debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0
debug3: receive packet: type 91
debug2: callback start
debug2: fd 3 setting TCP_NODELAY
debug3: ssh_packet_set_tos: set IP_TOS 0x10
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug3: send packet: type 98
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug2: channel 0: rcvd adjust 87380
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
debug1: PAM: establishing credentials
debug1: permanently_set_uid: 1024/100
Environment:
  USER=admin
  LOGNAME=admin
  HOME=/var/services/homes/admin
  PATH=/usr/bin:/bin:/usr/sbin:/sbin
  MAIL=/var/mail/admin
  SHELL=/bin/sh
  SSH_CLIENT=<client IP> 54376 22
  SSH_CONNECTION=<client IP> 54376 <server IP> 22
  SSH_TTY=/dev/pts/12
  TERM=xterm
admin@server:~$ 

SSH-Debug-Server.txt

admin@server:~$ sudo /usr/bin/sshd -d
debug1: Config token is ciphers
debug1: Config token is kexalgorithms
debug1: Config token is macs
debug1: Config token is rsaauthentication
debug1: Config token is pubkeyauthentication
debug1: Config token is authorizedkeysfile
debug1: Config token is challengeresponseauthentication
debug1: Config token is usepam
debug1: Config token is allowtcpforwarding
debug1: Config token is useprivilegeseparation
debug1: Config token is chrootdirectory
debug1: Config token is subsystem
debug1: Config token is match
debug1: Config token is allowtcpforwarding
debug1: Config token is match
debug1: Config token is allowtcpforwarding
debug1: Config token is match
debug1: Config token is allowtcpforwarding
debug1: Config token is gatewayports
debug1: HPN Buffer Size: 87380
debug1: sshd version OpenSSH_6.8, OpenSSL 1.0.2h-fips  3 May 2016
debug1: private host key #0: ssh-rsa SHA256:yX/j***
debug1: private host key #1: ssh-dss SHA256:ue7W***
debug1: private host key #2: ecdsa-sha2-nistp256 SHA256:1GXi***
debug1: private host key #3: ssh-ed25519 SHA256:wOMF***
debug1: rexec_argv[0]='/usr/bin/sshd'
debug1: rexec_argv[1]='-d'
Set /proc/self/oom_adj from 0 to -17
debug1: Bind to port 22 on 0.0.0.0.
debug1: Server TCP RWIN socket size: 87380
debug1: HPN Buffer Size: 87380
Server listening on 0.0.0.0 port 22.
debug1: Bind to port 22 on ::.
debug1: Server TCP RWIN socket size: 87380
debug1: HPN Buffer Size: 87380
Server listening on :: port 22.
debug1: Server will not fork when running in debugging mode.
debug1: rexec start in 6 out 6 newsock 6 pipe -1 sock 9
debug1: inetd sockets after dupping: 4, 4
Connection from <client IP> port 54376 on <server IP> port 22
debug1: HPN Disabled: 0, HPN Buffer Size: 87380
debug1: Client protocol version 2.0; client software version OpenSSH_7.3
SSH: Server;Ltype: Version;Remote: <client IP>-54376;Protocol: 2.0;Client: OpenSSH_7.3
debug1: match: OpenSSH_7.3 pat OpenSSH* compat 0x04000000
debug1: Remote is NON-HPN aware
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.8p1-hpn14v6
debug1: permanently_set_uid: 1024/100 [preauth]
debug1: list_hostkey_types: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519 [preauth]
debug1: SSH2_MSG_KEXINIT sent [preauth]
debug1: SSH2_MSG_KEXINIT received [preauth]
debug1: AUTH STATE IS 0 [preauth]
debug1: REQUESTED ENC.NAME is 'chacha20-poly1305@openssh.com' [preauth]
debug1: kex: client->server chacha20-poly1305@openssh.com <implicit> none [preauth]
SSH: Server;Ltype: Kex;Remote: <client IP>-54376;Enc: chacha20-poly1305@openssh.com;MAC: (null);Comp: none [preauth]
debug1: REQUESTED ENC.NAME is 'chacha20-poly1305@openssh.com' [preauth]
debug1: kex: server->client chacha20-poly1305@openssh.com <implicit> none [preauth]
debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth]
debug1: SSH2_MSG_NEWKEYS sent [preauth]
debug1: expecting SSH2_MSG_NEWKEYS [preauth]
debug1: SSH2_MSG_NEWKEYS received [preauth]
debug1: KEX done [preauth]
debug1: userauth-request for user admin service ssh-connection method none [preauth]
SSH: Server;Ltype: Authname;Remote: <client IP>-54376;Name: admin [preauth]
debug1: attempt 0 failures 0 [preauth]
debug1: get user realname admin => admin
debug1: Config token is ciphers
debug1: Config token is kexalgorithms
debug1: Config token is macs
debug1: Config token is rsaauthentication
debug1: Config token is pubkeyauthentication
debug1: Config token is authorizedkeysfile
debug1: Config token is challengeresponseauthentication
debug1: Config token is usepam
debug1: Config token is allowtcpforwarding
debug1: Config token is useprivilegeseparation
debug1: Config token is chrootdirectory
debug1: Config token is subsystem
debug1: Config token is match
debug1: Config token is allowtcpforwarding
debug1: Config token is match
debug1: user admin matched 'User admin' at line 154
debug1: Config token is allowtcpforwarding
debug1: Config token is match
debug1: Config token is allowtcpforwarding
debug1: Config token is gatewayports
debug1: PAM: initializing for "admin"
debug1: PAM: setting PAM_RHOST to "<client IP>"
debug1: PAM: setting PAM_TTY to "ssh"
debug1: userauth-request for user admin service ssh-connection method publickey [preauth]
debug1: attempt 1 failures 0 [preauth]
debug1: test whether pkalg/pkblob are acceptable [preauth]
debug1: temporarily_use_uid: 1024/100 (e=0/0)
debug1: trying public key file /var/services/homes/admin/.ssh/authorized_keys
debug1: fd 5 clearing O_NONBLOCK
debug1: matching key found: file /var/services/homes/admin/.ssh/authorized_keys, line 1 RSA SHA256:Kq+m***
debug1: restore_uid: 0/0
Postponed publickey for admin from <client IP> port 54376 ssh2 [preauth]
debug1: userauth-request for user admin service ssh-connection method password [preauth]
debug1: attempt 2 failures 0 [preauth]
debug1: PAM: password authentication accepted for admin
debug1: do_pam_account: called
Accepted password for admin from <client IP> port 54376 ssh2: RSA SHA256:Kq+m***
debug1: monitor_child_preauth: admin has been authenticated by privileged process
debug1: monitor_read_log: child log fd closed
debug1: PAM: establishing credentials
User child is on pid 18396
debug1: ssh_packet_set_postauth: called
debug1: Entering interactive session for SSH2.
debug1: server_init_dispatch_20
debug1: server_input_channel_open: ctype session rchan 0 win 1048576 max 16384
debug1: input_session_request
debug1: channel 0: new [server-session]
debug1: session_new: session 0
debug1: session_open: channel 0
debug1: session_open: session 0: link with channel 0
debug1: server_input_channel_open: confirm session
debug1: server_input_global_request: rtype no-more-sessions@openssh.com want_reply 0
debug1: server_input_channel_req: channel 0 request pty-req reply 1
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req pty-req
debug1: Allocating pty.
debug1: session_new: session 0
lastlog_openseek: Couldn't stat /var/log/lastlog: No such file or directory
lastlog_openseek: Couldn't stat /var/log/lastlog: No such file or directory
debug1: session_pty_req: session 0 alloc /dev/pts/12
debug1: Ignoring unsupported tty mode opcode 42 (0x2a)
debug1: server_input_channel_req: channel 0 request shell reply 1
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req shell
Starting session: shell on pts/12 for admin from <client IP> port 54376
debug1: Setting controlling tty using TIOCSCTTY.