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visual1956

impossibilité de se connecter en ssh depuis l'extérieur

Bonsoir
je me retourne vers le forum pour avoir des explications et surtout une aide concernant l’accès à un serveur de sauvegarde que je viens de réaliser avec une raspberry 2 et deux disques durs externes montés en raid1
j’utilise openssh avec une clé publique
lAprès avoir généré et transmis  ma clé publique sur un autre ordinateur de mon réseau local je n’ai aucun problème pour me connecter à mon serveur en utilisant l’adresse fixe de ma freebox dont j’ai redirigé le port 22 vers ma raspberry
par contre lorsque je désire me connecter  depuis un ordinateur externe j’ai systématiquement un rejet
lors de la transmission de la clé j’ai le message suivant

/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/patricia/.ssh/id_dsa.pub"
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys

pour essayer d’avoir plus d’info j’ai demandé lancé la connexion en mode verbeux et j’obtiens ceci

atricia@patricia:~$ ssh -vv patricia@88.181.210.52
OpenSSH_7.6p1 Ubuntu-4, 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 "88.181.210.52" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 88.181.210.52 [88.181.210.52] port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /home/patricia/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/patricia/.ssh/id_rsa-cert type -1
debug1: identity file /home/patricia/.ssh/id_dsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /home/patricia/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/patricia/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/patricia/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/patricia/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/patricia/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4p1 Raspbian-10+deb9u4
debug1: match: OpenSSH_7.4p1 Raspbian-10+deb9u4 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to 88.181.210.52:22 as 'patricia'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,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
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
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,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-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: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
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
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
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
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:ru2mHcaYoE6uDZE7TxLFTJjUaRqsPdV43rxq6veKS0U
debug1: Host '88.181.210.52' is known and matches the ECDSA host key.
debug1: Found key in /home/patricia/.ssh/known_hosts:1
debug2: set_newkeys: mode 1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug1: Skipping ssh-dss key /home/patricia/.ssh/id_dsa - not in PubkeyAcceptedKeyTypes
debug2: key: /home/patricia/.ssh/id_rsa ((nil))
debug2: key: /home/patricia/.ssh/id_ecdsa ((nil))
debug2: key: /home/patricia/.ssh/id_ed25519 ((nil))
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521>
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /home/patricia/.ssh/id_rsa
debug1: Trying private key: /home/patricia/.ssh/id_ecdsa
debug1: Trying private key: /home/patricia/.ssh/id_ed25519
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
patricia@88.181.210.52: Permission denied (publickey

je n’arrive pas à identifier mon erreur

sur mon serveur j’ai bien déclaré deux utilisateurs  j’ai bien l’accès via le réseau interneen utilisation l’adresse IP fixe
mais impossible de se connecter depuis l’extérieur

Ne voulant pas rester sur un échec je me retourne donc vers vous pour solliciter votre aide
Par avance merci

bruno

Re : impossibilité de se connecter en ssh depuis l'extérieur

Bonjour,

Il ne faut pas utiliser DSA qui est cassé et est refusé par les versions récentes d'openSSH :

/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/patricia/.ssh/id_dsa.pub"

Il te faut générer des clé RSA ou mieux ED25519 (cf man ssh-keygen)