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Ich möchte nur verstehen, wie ssh funktioniert. Wenn ich die Kommunikation mit wireshark geschnüffelt habe ich diese Pakete:ssh Protokoll wireshark capture (Pakete fehlen)
SSHv2 client: Protocol
SSHv2 server: Protocol
SSHv2 Client: Key Exchange Init
SSHv2 Server: Key Exchange Init
SSHv2 Client: Elliptic Diffie-Hellman Key Exchange Init
SSHv2 Server: Elliptic Diffie-Hellman Key Exchange Reply, New Keys, Encrypted packet
SSHv2 Client: New Keys
Danach alles verschlüsselt ist, habe ich meine Forschung und fand heraus, dass zwei Pakete fehlen:
SSHv2 Client: Diffie-Hellman GEX Init
SSHv2 Server: Diffie-Hellman GEX Reply
Diese 2 Zahlen werden dann verwendet, um den symmetrischen Schlüssel zu erzeugen!
Meine Frage ist, an welchem Punkt die 2 Nummern ausgetauscht werden und in welchen Paketen? Warum fehlen 2 Pakete? Liegt es daran, dass der SSH-Algorithmus geändert wurde? Oder ist es, weil die OpenSSH-Client-Version (Ich verwende OpenSSH_7.2p2 auf Ubuntu 16.04)
Sie finden unten die Ausgabe des Befehls ssh -v -v -v [email protected] plus den Screenshot.
Schönen Tag noch.
screenshot http://hpics.li/598bb8e
[email protected]:~$ ssh -v -v -v [email protected]
OpenSSH_7.2p2 Ubuntu-4ubuntu2.2, OpenSSL 1.0.2g-fips 1 Mar 2016
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "192.168.1.1" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 192.168.1.1 [192.168.1.1] port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /home/loucif/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/loucif/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/loucif/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/loucif/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/loucif/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/loucif/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/loucif/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/loucif/.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-4ubuntu2.2
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.2p2 Ubuntu-4ubuntu2.2
debug1: match: OpenSSH_7.2p2 Ubuntu-4ubuntu2.2 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to 192.168.1.1:22 as 'loucif'
debug3: hostkeys_foreach: reading file "/home/loucif/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/loucif/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from 192.168.1.1
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: [email protected],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: [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],aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc
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: [email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-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: [email protected]
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:s+3/VK4r8fauhX9bab+l+88gvu9Ky6fikXqP83bYsMo
debug3: hostkeys_foreach: reading file "/home/loucif/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/loucif/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from 192.168.1.1
debug1: Host '192.168.1.1' is known and matches the ECDSA host key.
debug1: Found key in /home/loucif/.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/loucif/.ssh/id_rsa ((nil))
debug2: key: /home/loucif/.ssh/id_dsa ((nil))
debug2: key: /home/loucif/.ssh/id_ecdsa ((nil))
debug2: key: /home/loucif/.ssh/id_ed25519 ((nil))
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
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 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: /home/loucif/.ssh/id_rsa
debug3: no such identity: /home/loucif/.ssh/id_rsa: No such file or directory
debug1: Trying private key: /home/loucif/.ssh/id_dsa
debug3: no such identity: /home/loucif/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /home/loucif/.ssh/id_ecdsa
debug3: no such identity: /home/loucif/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /home/loucif/.ssh/id_ed25519
debug3: no such identity: /home/loucif/.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
[email protected]'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 192.168.1.1 ([192.168.1.1]: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 [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: 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 XDG_VTNR
debug1: Sending env LC_PAPER = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug1: Sending env LC_ADDRESS = en_US.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
debug1: Sending env LC_MONETARY = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env CLUTTER_IM_MODULE
debug3: Ignored env SESSION
debug3: Ignored env GPG_AGENT_INFO
debug3: Ignored env TERM
debug3: Ignored env VTE_VERSION
debug3: Ignored env SHELL
debug3: Ignored env QT_LINUX_ACCESSIBILITY_ALWAYS_ON
debug3: Ignored env WINDOWID
debug1: Sending env LC_NUMERIC = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env UPSTART_SESSION
debug3: Ignored env GNOME_KEYRING_CONTROL
debug3: Ignored env GTK_MODULES
debug3: Ignored env USER
debug3: Ignored env LS_COLORS
debug1: Sending env LC_TELEPHONE = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env QT_ACCESSIBILITY
debug3: Ignored env XDG_SESSION_PATH
debug3: Ignored env XDG_SEAT_PATH
debug3: Ignored env SSH_AUTH_SOCK
debug3: Ignored env DEFAULTS_PATH
debug3: Ignored env XDG_CONFIG_DIRS
debug3: Ignored env DESKTOP_SESSION
debug3: Ignored env PATH
debug3: Ignored env QT_IM_MODULE
debug3: Ignored env QT_QPA_PLATFORMTHEME
debug1: Sending env LC_IDENTIFICATION = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env XDG_SESSION_TYPE
debug3: Ignored env PWD
debug3: Ignored env JOB
debug3: Ignored env XMODIFIERS
debug3: Ignored env GNOME_KEYRING_PID
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 MANDATORY_PATH
debug1: Sending env LC_MEASUREMENT = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env COMPIZ_CONFIG_PROFILE
debug3: Ignored env IM_CONFIG_PHASE
debug3: Ignored env PAPERSIZE
debug3: Ignored env GDMSESSION
debug3: Ignored env SESSIONTYPE
debug3: Ignored env GTK2_MODULES
debug3: Ignored env SHLVL
debug3: Ignored env HOME
debug3: Ignored env XDG_SEAT
debug3: Ignored env LANGUAGE
debug3: Ignored env LIBGL_ALWAYS_SOFTWARE
debug3: Ignored env GNOME_DESKTOP_SESSION_ID
debug3: Ignored env UPSTART_INSTANCE
debug3: Ignored env UPSTART_EVENTS
debug3: Ignored env XDG_SESSION_DESKTOP
debug3: Ignored env LOGNAME
debug3: Ignored env COMPIZ_BIN_PATH
debug3: Ignored env DBUS_SESSION_BUS_ADDRESS
debug3: Ignored env XDG_DATA_DIRS
debug3: Ignored env QT4_IM_MODULE
debug3: Ignored env LESSOPEN
debug3: Ignored env INSTANCE
debug3: Ignored env UPSTART_JOB
debug3: Ignored env XDG_RUNTIME_DIR
debug3: Ignored env DISPLAY
debug3: Ignored env XDG_CURRENT_DESKTOP
debug3: Ignored env GTK_IM_MODULE
debug3: Ignored env LESSCLOSE
debug1: Sending env LC_TIME = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug1: Sending env LC_NAME = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env XAUTHORITY
debug3: Ignored env _
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 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 16.04.1 LTS (GNU/Linux 4.4.0-31-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
519 paquets peuvent être mis à jour.
278 mises à jour de sécurité.
Last login: Sat Dec 30 14:35:41 2017 from 192.168.1.2
[email protected]:~$
Können Sie den Client mit 3 '-v' Optionen starten und die Ausgabe zu Ihrer Frage hinzufügen? – philant
Ich habe nicht bekommen, was Sie mich gebeten, philant –
'ssh -v -v -v Benutzer @ Server' zu tun. Welchen Kunden benutzen Sie? – philant