Wenn ich meinen öffentlichen Schlüssel auf den Server kopiere, ssh-copy-idlehnt der Server meine Verbindungen aktiv mit einem einfachen Fehler vom Typ 51 ab.
OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n 7 Dec 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "srv2.euroexpress.ba" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to srv2.euroexpress.ba [217.24.137.67] port 22.
debug1: Connection established.
debug1: identity file /home/ognjen/.ssh/id_rsa.pub type 0
debug1: key_load_public: No such file or directory
debug1: identity file /home/ognjen/.ssh/id_rsa.pub-cert type -1
debug1: identity file /home/ognjen/.ssh/id_rsa type 0
debug1: key_load_public: No such file or directory
debug1: identity file /home/ognjen/.ssh/id_rsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
debug1: match: OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to srv2.euroexpress.ba:22 as 'ubuntu'
debug3: hostkeys_foreach: reading file "/home/ognjen/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/ognjen/.ssh/known_hosts:21
debug3: load_hostkeys: loaded 1 keys from srv2.euroexpress.ba
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],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,[email protected],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: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],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,[email protected],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
debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] 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:Tm8InBcntxskXCE3QLLydzbXDHptDFANbmxx1oeav4U
debug3: hostkeys_foreach: reading file "/home/ognjen/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/ognjen/.ssh/known_hosts:21
debug3: load_hostkeys: loaded 1 keys from srv2.euroexpress.ba
debug3: hostkeys_foreach: reading file "/home/ognjen/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/ognjen/.ssh/known_hosts:18
debug3: load_hostkeys: loaded 1 keys from 217.24.137.67
debug1: Host 'srv2.euroexpress.ba' is known and matches the ECDSA host key.
debug1: Found key in /home/ognjen/.ssh/known_hosts:21
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
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug2: key: /home/ognjen/.ssh/id_rsa.pub (0x55b8f444abf0), explicit, agent
debug2: key: /home/ognjen/.ssh/id_rsa (0x55b8f44577c0)
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: password
debug3: start over, passed a different list password
debug3: preferred publickey
debug1: No more authentication methods to try.
[email protected]: Permission denied (password).
Eine einfache Problemumgehung hierfür besteht darin, einen Daemon manuell als Root auf einem anderen Port zu starten:
# /usr/sbin/sshd -D -d -e -p 80 -f /etc/ssh/sshd_config
Dann funktioniert mit demselben Befehl, derselben Konfiguration, demselben Client und derselben Daemon-Binärdatei auf einem anderen Port alles:
OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n 7 Dec 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "srv2.euroexpress.ba" port 80
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to srv2.euroexpress.ba [217.24.137.67] port 80.
debug1: Connection established.
debug1: identity file /home/ognjen/.ssh/id_rsa.pub type 0
debug1: key_load_public: No such file or directory
debug1: identity file /home/ognjen/.ssh/id_rsa.pub-cert type -1
debug1: identity file /home/ognjen/.ssh/id_rsa type 0
debug1: key_load_public: No such file or directory
debug1: identity file /home/ognjen/.ssh/id_rsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
debug1: match: OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to srv2.euroexpress.ba:80 as 'ubuntu'
debug3: put_host_port: [srv2.euroexpress.ba]:80
debug3: hostkeys_foreach: reading file "/home/ognjen/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/ognjen/.ssh/known_hosts:22
debug3: load_hostkeys: loaded 1 keys from [srv2.euroexpress.ba]:80
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],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,[email protected],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: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],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,[email protected],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
debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] 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 SHA256:5EaeFSj8YH5+W+RPW5mQc7hwtD3A5Gq0QeFyPYTt+eE
debug3: put_host_port: [217.24.137.67]:80
debug3: put_host_port: [srv2.euroexpress.ba]:80
debug3: hostkeys_foreach: reading file "/home/ognjen/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/ognjen/.ssh/known_hosts:22
debug3: load_hostkeys: loaded 1 keys from [srv2.euroexpress.ba]:80
debug3: hostkeys_foreach: reading file "/home/ognjen/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/ognjen/.ssh/known_hosts:23
debug3: load_hostkeys: loaded 1 keys from [217.24.137.67]:80
debug1: Host '[srv2.euroexpress.ba]:80' is known and matches the ECDSA host key.
debug1: Found key in /home/ognjen/.ssh/known_hosts:22
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
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug2: key: /home/ognjen/.ssh/id_rsa.pub (0x555da0469bf0), explicit, agent
debug2: key: /home/ognjen/.ssh/id_rsa (0x555da04767c0)
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521>
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
debug3: authmethod_lookup publickey
debug3: remaining preferred:
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: RSA SHA256:HX7ZtVhHTzHP8djnbaGRBrTYdNmu92E5PsNRERe7bc8 /home/ognjen/.ssh/id_rsa.pub
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 rsa-sha2-512 blen 279
debug2: input_userauth_pk_ok: fp SHA256:HX7ZtVhHTzHP8djnbaGRBrTYdNmu92E5PsNRERe7bc8
debug3: sign_and_send_pubkey: RSA SHA256:HX7ZtVhHTzHP8djnbaGRBrTYdNmu92E5PsNRERe7bc8
debug3: send packet: type 50
debug3: receive packet: type 52
debug1: Authentication succeeded (publickey).
Authenticated to srv2.euroexpress.ba ([217.24.137.67]:80).
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 [email protected]
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: network
debug3: receive packet: type 80
debug1: client_input_global_request: rtype [email protected] want_reply 0
debug3: receive packet: type 91
debug2: channel_input_open_confirmation: channel 0: 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
debug1: Sending environment.
debug3: Ignored env LS_COLORS
debug1: Sending env LC_MEASUREMENT = bs_BA.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env LESSCLOSE
debug1: Sending env LC_PAPER = bs_BA.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug1: Sending env LC_MONETARY = bs_BA.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug1: Sending env LANG = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env GDM_LANG
debug3: Ignored env DISPLAY
debug3: Ignored env COMPIZ_CONFIG_PROFILE
debug3: Ignored env GTK_OVERLAY_SCROLLING
debug3: Ignored env COLORTERM
debug3: Ignored env XDG_VTNR
debug3: Ignored env SSH_AUTH_SOCK
debug3: Ignored env MANDATORY_PATH
debug1: Sending env LC_NAME = bs_BA.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env XDG_SESSION_ID
debug3: Ignored env XDG_GREETER_DATA_DIR
debug3: Ignored env USER
debug3: Ignored env DESKTOP_SESSION
debug3: Ignored env DEFAULTS_PATH
debug3: Ignored env QT_QPA_PLATFORMTHEME
debug3: Ignored env PWD
debug3: Ignored env HOME
debug3: Ignored env SSH_AGENT_PID
debug3: Ignored env QT_ACCESSIBILITY
debug3: Ignored env XDG_SESSION_TYPE
debug3: Ignored env XDG_DATA_DIRS
debug3: Ignored env MATE_DESKTOP_SESSION_ID
debug3: Ignored env XDG_SESSION_DESKTOP
debug3: Ignored env QT_SCALE_FACTOR
debug1: Sending env LC_ADDRESS = bs_BA.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug1: Sending env LC_NUMERIC = bs_BA.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env GTK_MODULES
debug3: Ignored env UBUNTU_MENUPROXY
debug3: Ignored env SHELL
debug3: Ignored env VTE_VERSION
debug3: Ignored env TERM
debug3: Ignored env XDG_SEAT_PATH
debug3: Ignored env XDG_CURRENT_DESKTOP
debug3: Ignored env GPG_AGENT_INFO
debug3: Ignored env XDG_SEAT
debug3: Ignored env SHLVL
debug3: Ignored env LANGUAGE
debug3: Ignored env WINDOWID
debug1: Sending env LC_TELEPHONE = bs_BA.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env GDMSESSION
debug3: Ignored env LOGNAME
debug3: Ignored env DBUS_SESSION_BUS_ADDRESS
debug3: Ignored env XDG_RUNTIME_DIR
debug3: Ignored env XAUTHORITY
debug3: Ignored env XDG_SESSION_PATH
debug3: Ignored env QT_AUTO_SCREEN_SCALE_FACTOR
debug3: Ignored env XDG_CONFIG_DIRS
debug3: Ignored env PATH
debug1: Sending env LC_IDENTIFICATION = bs_BA.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env SESSION_MANAGER
debug3: Ignored env LESSOPEN
debug1: Sending env LC_TIME = bs_BA.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env _
debug3: Ignored env OLDPWD
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: channel_input_open_confirmation: channel 0: 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 2097152
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
Welcome to Ubuntu 18.04.2 LTS (GNU/Linux 4.15.0-55-generic x86_64)
Dies ist auf zwei verschiedenen Maschinen in unserem Stack aufgetreten, beides nicht lokale Maschinen.
Antwort1
Ich würde das Serverprotokoll von untersuchensshdob es die Datei mit autorisierten Schlüsseln lesen kann.
Danach prüfe ich die Ausgabe systemctl cat sshdund suche nach Besonderheiten.
Überprüfen Sie außerdem, obsshdläuft beschränkt mitAppArmor( ps auxZ). Wenn ja, überprüfen Sie das Protokoll vongeprüftfür DENIEDLinien.