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    Příspěvek
    7.5.2016 11:26 lertimir | skóre: 64 | blog: Par_slov
    Rozbalit Rozbalit vše Re: Logy sshd přes systemd
    Jestli jsem to nepopsal dobře tak znovu. Mám systémy 1 (server), 2 (noraza) 3 (dnopytle). 1 je server který dělá zálohování spojením ssh na klienty a spuštění na nich skriptu se rsync. Nefunguje spojení 1->2, funguje spojení 1->3 a stejně tak spojení mezi 3->2, takže 1 se chová jako korektní ssh klient a 2 se chová jako korektní server při správném spojení. Ale při spojení 1->2 to nejvyšší verbosita vypíše. Je vidět že TCP se nahodí, domluví se o verzích a někde kolem domluvy o šifrovacích algoritmech to server zavře:
    ssh -vvv root@noraza      
    OpenSSH_5.3p1, OpenSSL 1.0.1e-fips 11 Feb 2013
    debug1: Reading configuration data /etc/ssh/ssh_config
    debug1: Applying options for *
    debug2: ssh_connect: needpriv 0
    debug1: Connecting to noraza [2001:xxxx:xxxx:xxxx::561] port 22.
    debug1: Connection established.
    debug1: identity file /var/lib/BackupPC/.ssh/identity type -1
    debug1: identity file /var/lib/BackupPC/.ssh/identity-cert type -1
    debug3: Not a RSA1 key file /var/lib/BackupPC/.ssh/id_rsa.
    debug2: key_type_from_name: unknown key type '-----BEGIN'
    debug3: key_read: missing keytype
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug2: key_type_from_name: unknown key type '-----END'
    debug3: key_read: missing keytype
    debug1: identity file /var/lib/BackupPC/.ssh/id_rsa type 1
    debug1: identity file /var/lib/BackupPC/.ssh/id_rsa-cert type -1
    debug1: identity file /var/lib/BackupPC/.ssh/id_dsa type -1
    debug1: identity file /var/lib/BackupPC/.ssh/id_dsa-cert type -1
    debug1: identity file /var/lib/BackupPC/.ssh/id_ecdsa type -1
    debug1: identity file /var/lib/BackupPC/.ssh/id_ecdsa-cert type -1
    debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1
    debug1: match: OpenSSH_6.6.1 pat OpenSSH*
    debug1: Enabling compatibility mode for protocol 2.0
    debug1: Local version string SSH-2.0-OpenSSH_5.3
    debug2: fd 3 setting O_NONBLOCK
    debug1: SSH2_MSG_KEXINIT sent
    debug3: Wrote 960 bytes for a total of 981
    debug1: SSH2_MSG_KEXINIT received
    debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
    debug2: kex_parse_kexinit: ssh-rsa-cert-v01@openssh.com,ssh-dss-cert-v01@openssh.com,ssh-rsa-cert-v00@openssh.com,ssh-dss-cert-v00@openssh.com,ssh-rsa,ssh-dss
    debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
    debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
    debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
    debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
    debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
    debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
    debug2: kex_parse_kexinit: 
    debug2: kex_parse_kexinit: 
    debug2: kex_parse_kexinit: first_kex_follows 0 
    debug2: kex_parse_kexinit: reserved 0 
    debug2: kex_parse_kexinit: 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,diffie-hellman-group1-sha1
    debug2: kex_parse_kexinit: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519
    debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
    debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
    debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
    debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
    debug2: kex_parse_kexinit: none,zlib@openssh.com
    debug2: kex_parse_kexinit: none,zlib@openssh.com
    debug2: kex_parse_kexinit: 
    debug2: kex_parse_kexinit: 
    debug2: kex_parse_kexinit: first_kex_follows 0 
    debug2: kex_parse_kexinit: reserved 0 
    debug2: mac_setup: found hmac-md5
    debug1: kex: server->client aes128-ctr hmac-md5 none
    debug2: mac_setup: found hmac-md5
    debug1: kex: client->server aes128-ctr hmac-md5 none
    debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
    debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
    debug3: Wrote 24 bytes for a total of 1005
    debug2: dh_gen_key: priv key bits set: 109/256
    debug2: bits set: 503/1024
    debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
    debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
    debug3: Wrote 144 bytes for a total of 1149
    Connection closed by 2001:xxxx:xxxx:xxxx::561
    
    A pomrví se to někde kolem Diffie-Hellman protokolu na výměnu klíče. Nicméně ssh se nahazovalo a nedojelo až do autentizace a potřebuji vědět proč to noraza típla. Z výpisu plyne, že to zavřel server. Ale v journalctl je až výsledek po autentizaci. Ten samý klient připojující se na 3. dopadne správně.
     ssh -vvv root@dnopytle
    OpenSSH_5.3p1, OpenSSL 1.0.1e-fips 11 Feb 2013
    debug1: Reading configuration data /etc/ssh/ssh_config
    debug1: Applying options for *
    debug2: ssh_connect: needpriv 0
    debug1: Connecting to dnopytle [10.0.0.10] port 22.
    debug1: Connection established.
    debug1: identity file /var/lib/BackupPC/.ssh/identity type -1
    debug1: identity file /var/lib/BackupPC/.ssh/identity-cert type -1
    debug3: Not a RSA1 key file /var/lib/BackupPC/.ssh/id_rsa.
    debug2: key_type_from_name: unknown key type '-----BEGIN'
    debug3: key_read: missing keytype
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug2: key_type_from_name: unknown key type '-----END'
    debug3: key_read: missing keytype
    debug1: identity file /var/lib/BackupPC/.ssh/id_rsa type 1
    debug1: identity file /var/lib/BackupPC/.ssh/id_rsa-cert type -1
    debug1: identity file /var/lib/BackupPC/.ssh/id_dsa type -1
    debug1: identity file /var/lib/BackupPC/.ssh/id_dsa-cert type -1
    debug1: identity file /var/lib/BackupPC/.ssh/id_ecdsa type -1
    debug1: identity file /var/lib/BackupPC/.ssh/id_ecdsa-cert type -1
    debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1
    debug1: match: OpenSSH_6.6.1 pat OpenSSH*
    debug1: Enabling compatibility mode for protocol 2.0
    debug1: Local version string SSH-2.0-OpenSSH_5.3
    debug2: fd 3 setting O_NONBLOCK
    debug1: SSH2_MSG_KEXINIT sent
    debug3: Wrote 960 bytes for a total of 981
    debug1: SSH2_MSG_KEXINIT received
    debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
    debug2: kex_parse_kexinit: ssh-rsa-cert-v01@openssh.com,ssh-dss-cert-v01@openssh.com,ssh-rsa-cert-v00@openssh.com,ssh-dss-cert-v00@openssh.com,ssh-rsa,ssh-dss
    debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
    debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
    debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
    debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
    debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
    debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
    debug2: kex_parse_kexinit: 
    debug2: kex_parse_kexinit: 
    debug2: kex_parse_kexinit: first_kex_follows 0 
    debug2: kex_parse_kexinit: reserved 0 
    debug2: kex_parse_kexinit: 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,diffie-hellman-group1-sha1
    debug2: kex_parse_kexinit: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519
    debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
    debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
    debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
    debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
    debug2: kex_parse_kexinit: none,zlib@openssh.com
    debug2: kex_parse_kexinit: none,zlib@openssh.com
    debug2: kex_parse_kexinit: 
    debug2: kex_parse_kexinit: 
    debug2: kex_parse_kexinit: first_kex_follows 0 
    debug2: kex_parse_kexinit: reserved 0 
    debug2: mac_setup: found hmac-md5
    debug1: kex: server->client aes128-ctr hmac-md5 none
    debug2: mac_setup: found hmac-md5
    debug1: kex: client->server aes128-ctr hmac-md5 none
    debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
    debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
    debug3: Wrote 24 bytes for a total of 1005
    debug2: dh_gen_key: priv key bits set: 127/256
    debug2: bits set: 504/1024
    debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
    debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
    debug3: Wrote 144 bytes for a total of 1149
    debug3: check_host_in_hostfile: host dnopytle filename /var/lib/BackupPC/.ssh/known_hosts
    debug3: check_host_in_hostfile: host dnopytle filename /var/lib/BackupPC/.ssh/known_hosts
    debug3: check_host_in_hostfile: match line 2
    debug3: check_host_in_hostfile: host 10.0.0.10 filename /var/lib/BackupPC/.ssh/known_hosts
    debug3: check_host_in_hostfile: host 10.0.0.10 filename /var/lib/BackupPC/.ssh/known_hosts
    debug3: check_host_in_hostfile: match line 1
    debug1: Host 'dnopytle' is known and matches the RSA host key.
    debug1: Found key in /var/lib/BackupPC/.ssh/known_hosts:2
    debug2: bits set: 528/1024
    debug1: ssh_rsa_verify: signature correct
    debug2: kex_derive_keys
    debug2: set_newkeys: mode 1
    debug1: SSH2_MSG_NEWKEYS sent
    debug1: expecting SSH2_MSG_NEWKEYS
    debug3: Wrote 16 bytes for a total of 1165
    debug2: set_newkeys: mode 0
    debug1: SSH2_MSG_NEWKEYS received
    debug1: SSH2_MSG_SERVICE_REQUEST sent
    debug3: Wrote 48 bytes for a total of 1213
    debug2: service_accept: ssh-userauth
    debug1: SSH2_MSG_SERVICE_ACCEPT received
    debug2: key: /var/lib/BackupPC/.ssh/identity ((nil))
    debug2: key: /var/lib/BackupPC/.ssh/id_rsa (0x1b7bcf0)
    debug2: key: /var/lib/BackupPC/.ssh/id_dsa ((nil))
    debug2: key: /var/lib/BackupPC/.ssh/id_ecdsa ((nil))
    debug3: Wrote 64 bytes for a total of 1277
    debug1: Authentications that can continue: publickey,keyboard-interactive
    debug3: start over, passed a different list publickey,keyboard-interactive
    debug3: preferred gssapi-keyex,gssapi-with-mic,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: Trying private key: /var/lib/BackupPC/.ssh/identity
    debug3: no such identity: /var/lib/BackupPC/.ssh/identity
    debug1: Offering public key: /var/lib/BackupPC/.ssh/id_rsa
    debug3: send_pubkey_test
    debug2: we sent a publickey packet, wait for reply
    debug3: Wrote 368 bytes for a total of 1645
    debug1: Server accepts key: pkalg ssh-rsa blen 277
    debug2: input_userauth_pk_ok: SHA1 fp 6c:03:0a:d2:6b:bf:99:4e:57:06:66:1e:d3:83:b8:4d:20:f1:ee:d4
    debug3: sign_and_send_pubkey: RSA 6c:03:0a:d2:6b:bf:99:4e:57:06:66:1e:d3:83:b8:4d:20:f1:ee:d4
    debug1: read PEM private key done: type RSA
    debug3: Wrote 640 bytes for a total of 2285
    debug1: Authentication succeeded (publickey).
    debug1: channel 0: new [client-session]
    debug3: ssh_session2_open: channel_new: 0
    debug2: channel 0: send open
    debug1: Requesting no-more-sessions@openssh.com
    debug1: Entering interactive session.
    debug3: Wrote 128 bytes for a total of 2413
    debug2: callback start
    debug2: client_session2_setup: id 0
    debug2: channel 0: request pty-req confirm 1
    debug1: Sending environment.
    debug3: Ignored env HOSTNAME
    debug3: Ignored env SHELL
    debug3: Ignored env TERM
    debug3: Ignored env HISTSIZE
    debug3: Ignored env QTDIR
    debug3: Ignored env QTINC
    debug3: Ignored env USER
    debug3: Ignored env LS_COLORS
    debug3: Ignored env MAIL
    debug3: Ignored env PATH
    debug3: Ignored env PWD
    debug1: Sending env LANG = en_US.UTF-8
    debug2: channel 0: request env confirm 0
    debug3: Ignored env HISTCONTROL
    debug3: Ignored env SHLVL
    debug3: Ignored env HOME
    debug3: Ignored env LOGNAME
    debug3: Ignored env QTLIB
    debug3: Ignored env CVS_RSH
    debug3: Ignored env LESSOPEN
    debug3: Ignored env G_BROKEN_FILENAMES
    debug3: Ignored env _
    debug2: channel 0: request shell confirm 1
    debug2: fd 3 setting TCP_NODELAY
    debug2: callback done
    debug2: channel 0: open confirm rwindow 0 rmax 32768
    debug3: Wrote 448 bytes for a total of 2861
    debug2: channel_input_status_confirm: type 99 id 0
    debug2: PTY allocation request accepted on channel 0
    debug2: channel 0: rcvd adjust 2097152
    debug2: channel_input_status_confirm: type 99 id 0
    debug2: shell request accepted on channel 0
    Last login: Fri Mar 18 09:01:17 2016
    Have a lot of fun...
    dnopytle:~ # 
    (a v IPv6 to samozřejmě není když to první neuspěšné spojení udělám s -4 tak stejně neprojde) stejně tak, když se připojuji s 3 na 2 tak to také projde.
    dnopytle:~ # ssh -vvv noraza
    OpenSSH_6.6.1, OpenSSL 1.0.1k-fips 8 Jan 2015
    debug1: Reading configuration data /etc/ssh/ssh_config
    debug1: /etc/ssh/ssh_config line 20: Applying options for *
    debug2: ssh_connect: needpriv 0
    debug1: Connecting to noraza [2001:xxxx:xxxx:xxxx::d39] port 22.
    debug1: Connection established.
    debug1: permanently_set_uid: 0/0
    debug3: Incorrect RSA1 identifier
    debug3: Could not load "/root/.ssh/id_rsa" as a RSA1 public key
    debug1: identity file /root/.ssh/id_rsa type 1
    debug1: identity file /root/.ssh/id_rsa-cert type -1
    debug1: identity file /root/.ssh/id_dsa type -1
    debug1: identity file /root/.ssh/id_dsa-cert type -1
    debug1: identity file /root/.ssh/id_ecdsa type -1
    debug1: identity file /root/.ssh/id_ecdsa-cert type -1
    debug1: identity file /root/.ssh/id_ed25519 type -1
    debug1: identity file /root/.ssh/id_ed25519-cert type -1
    debug1: Enabling compatibility mode for protocol 2.0
    debug1: Local version string SSH-2.0-OpenSSH_6.6.1
    debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1
    debug1: match: OpenSSH_6.6.1 pat OpenSSH_6.6.1* compat 0x04000000
    debug2: fd 3 setting O_NONBLOCK
    debug3: load_hostkeys: loading entries for host "noraza" from file "/root/.ssh/known_hosts"
    debug3: load_hostkeys: found key type ECDSA in file /root/.ssh/known_hosts:25
    debug3: load_hostkeys: loaded 1 keys
    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
    debug1: SSH2_MSG_KEXINIT sent
    debug1: SSH2_MSG_KEXINIT received
    debug2: kex_parse_kexinit: 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,diffie-hellman-group1-sha1
    debug2: kex_parse_kexinit: 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-dss-cert-v01@openssh.com,ssh-rsa-cert-v00@openssh.com,ssh-dss-cert-v00@openssh.com,ssh-ed25519,ssh-rsa,ssh-dss
    debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
    debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
    debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
    debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
    debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
    debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
    debug2: kex_parse_kexinit: 
    debug2: kex_parse_kexinit: 
    debug2: kex_parse_kexinit: first_kex_follows 0 
    debug2: kex_parse_kexinit: reserved 0 
    debug2: kex_parse_kexinit: 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,diffie-hellman-group1-sha1
    debug2: kex_parse_kexinit: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519
    debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
    debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
    debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
    debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
    debug2: kex_parse_kexinit: none,zlib@openssh.com
    debug2: kex_parse_kexinit: none,zlib@openssh.com
    debug2: kex_parse_kexinit: 
    debug2: kex_parse_kexinit: 
    debug2: kex_parse_kexinit: first_kex_follows 0 
    debug2: kex_parse_kexinit: reserved 0 
    debug2: mac_setup: setup hmac-md5-etm@openssh.com
    debug1: kex: server->client aes128-ctr hmac-md5-etm@openssh.com none
    debug2: mac_setup: setup hmac-md5-etm@openssh.com
    debug1: kex: client->server aes128-ctr hmac-md5-etm@openssh.com none
    debug1: sending SSH2_MSG_KEX_ECDH_INIT
    debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
    debug1: Server host key: ECDSA 74:58:72:b9:3f:7a:32:e8:d0:21:6b:ae:46:b7:15:cb [MD5]
    debug3: load_hostkeys: loading entries for host "noraza" from file "/root/.ssh/known_hosts"
    debug3: load_hostkeys: found key type ECDSA in file /root/.ssh/known_hosts:25
    debug3: load_hostkeys: loaded 1 keys
    debug3: load_hostkeys: loading entries for host "2001:xxxx:xxxx:xxxx::d39" from file "/root/.ssh/known_hosts"
    debug3: load_hostkeys: loaded 0 keys
    debug1: Host 'noraza' is known and matches the ECDSA host key.
    debug1: Found key in /root/.ssh/known_hosts:25
    Warning: Permanently added the ECDSA host key for IP address '2001:xxxx:xxxx:xxxx::d39' to the list of known hosts.
    debug1: ssh_ecdsa_verify: signature correct
    debug2: kex_derive_keys
    debug2: set_newkeys: mode 1
    debug1: SSH2_MSG_NEWKEYS sent
    debug1: expecting SSH2_MSG_NEWKEYS
    debug2: set_newkeys: mode 0
    debug1: SSH2_MSG_NEWKEYS received
    debug1: SSH2_MSG_SERVICE_REQUEST sent
    debug2: service_accept: ssh-userauth
    debug1: SSH2_MSG_SERVICE_ACCEPT received
    debug2: key: /root/.ssh/id_rsa (0x7f343193daf0),
    debug2: key: /root/.ssh/id_dsa ((nil)),
    debug2: key: /root/.ssh/id_ecdsa ((nil)),
    debug2: key: /root/.ssh/id_ed25519 ((nil)),
    debug1: Authentications that can continue: publickey,keyboard-interactive
    debug3: start over, passed a different list publickey,keyboard-interactive
    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: /root/.ssh/id_rsa
    debug3: send_pubkey_test
    debug2: we sent a publickey packet, wait for reply
    debug1: Server accepts key: pkalg ssh-rsa blen 535
    debug2: input_userauth_pk_ok: fp 33:f3:63:1b:45:f6:3a:bd:ab:e9:6b:e1:01:b1:0e:bb [MD5]
    debug3: sign_and_send_pubkey: RSA 33:f3:63:1b:45:f6:3a:bd:ab:e9:6b:e1:01:b1:0e:bb [MD5]
    debug1: key_parse_private2: missing begin marker
    debug1: read PEM private key done: type RSA
    debug1: Authentication succeeded (publickey).
    Authenticated to noraza ([2001:xxxx:xxxx:xxxx::d39]:22).
    debug1: channel 0: new [client-session]
    debug3: ssh_session2_open: channel_new: 0
    debug2: channel 0: send open
    debug1: Requesting no-more-sessions@openssh.com
    debug1: Entering interactive session.
    debug2: callback start
    debug2: fd 3 setting TCP_NODELAY
    debug3: packet_set_tos: set IPV6_TCLASS 0x10
    debug2: client_session2_setup: id 0
    debug2: channel 0: request pty-req confirm 1
    debug1: Sending environment.
    debug3: Ignored env LESSKEY
    debug3: Ignored env XDG_VTNR
    debug3: Ignored env NNTPSERVER
    debug3: Ignored env MANPATH
    debug3: Ignored env XDG_SESSION_ID
    debug3: Ignored env HOSTNAME
    debug3: Ignored env XKEYSYMDB
    debug3: Ignored env HOST
    debug3: Ignored env SHELL
    debug3: Ignored env TERM
    debug3: Ignored env PROFILEREAD
    debug3: Ignored env HISTSIZE
    debug3: Ignored env MORE
    debug3: Ignored env JRE_HOME
    debug3: Ignored env USER
    debug3: Ignored env LS_COLORS
    debug3: Ignored env XNLSPATH
    debug3: Ignored env QEMU_AUDIO_DRV
    debug3: Ignored env HOSTTYPE
    debug3: Ignored env CONFIG_SITE
    debug3: Ignored env FROM_HEADER
    debug3: Ignored env PAGER
    debug3: Ignored env CSHEDIT
    debug3: Ignored env XDG_CONFIG_DIRS
    debug3: Ignored env MINICOM
    debug3: Ignored env MAIL
    debug3: Ignored env PATH
    debug3: Ignored env CPU
    debug3: Ignored env JAVA_BINDIR
    debug3: Ignored env INPUTRC
    debug3: Ignored env PWD
    debug3: Ignored env JAVA_HOME
    debug1: Sending env LANG = cs_CZ.UTF-8
    debug2: channel 0: request env confirm 0
    debug3: Ignored env PYTHONSTARTUP
    debug3: Ignored env GPG_TTY
    debug3: Ignored env AUDIODRIVER
    debug3: Ignored env QT_SYSTEM_DIR
    debug3: Ignored env SHLVL
    debug3: Ignored env XDG_SEAT
    debug3: Ignored env HOME
    debug3: Ignored env SDL_AUDIODRIVER
    debug3: Ignored env ALSA_CONFIG_PATH
    debug3: Ignored env LESS_ADVANCED_PREPROCESSOR
    debug3: Ignored env OSTYPE
    debug3: Ignored env LS_OPTIONS
    debug3: Ignored env XCURSOR_THEME
    debug3: Ignored env WINDOWMANAGER
    debug3: Ignored env G_FILENAME_ENCODING
    debug3: Ignored env LESS
    debug3: Ignored env MACHTYPE
    debug3: Ignored env LOGNAME
    debug3: Ignored env CVS_RSH
    debug3: Ignored env XDG_DATA_DIRS
    debug3: Ignored env LESSOPEN
    debug3: Ignored env DISPLAY
    debug3: Ignored env XDG_RUNTIME_DIR
    debug3: Ignored env XAUTHLOCALHOSTNAME
    debug3: Ignored env VDPAU_DRIVER
    debug3: Ignored env LESSCLOSE
    debug3: Ignored env G_BROKEN_FILENAMES
    debug3: Ignored env JAVA_ROOT
    debug3: Ignored env COLORTERM
    debug3: Ignored env XAUTHORITY
    debug3: Ignored env BASH_FUNC_mc%%
    debug3: Ignored env _
    debug2: channel 0: request shell confirm 1
    debug2: callback done
    debug2: channel 0: open confirm rwindow 0 rmax 32768
    debug2: channel_input_status_confirm: type 99 id 0
    debug2: PTY allocation request accepted on channel 0
    debug2: channel 0: rcvd adjust 2097152
    debug2: channel_input_status_confirm: type 99 id 0
    debug2: shell request accepted on channel 0
    Last login: Tue May  3 23:34:24 2016 from 2001:xxxx:xxxx:xxxx:xxxx:1f61:d3bf:b75c
    Have a lot of fun...
    noraza:~ # 
    
    Taky je podstatné, že to není nový klient, nové spojení. Fungovalo rok. Nicméně poslední záloha proběhla 1.5.2016 a od té doby se připojení nefunguje. Vzhledem k tomu, že na distro na klientu je roling release opensuse tumbleweed a aktualizací je opravdu hodně, tak mám podezření, že některá přinesla změnu pravidel pro povolené šifrovací algoritmy, (generátory prvočísel) nebo něco podobného, a na šifrách se server nedomluví se starším klientem na CentOS 6. S novějším klientem na opensuse 13.2 se domluví. Stejně tak se CentOS dohodne na algoritmech s 13.2. A nemohu najít, co je chybně.

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