Vedo che stai usando un client nuovo (OpenSSH_9.3p1) per connetterti ad
un server "vecchio" (OpenSSH_8.4p1). Dalla versione 8.8p1 sono stati
disattivati alcuni algoritmi considerati poco sicuri. Puoi provare ad
abilitarli per quell'host in .ssh/config (sul client):
Host dominio.org
HostkeyAlgorithms +ssh-rsa
PubkeyAcceptedAlgorithms +ssh-rsa
Ciao,
federico
On 20/07/23 11:56, Leandro Noferini wrote:
Ciao a tutti,
ho un server ssh al quale mi connetto regolarmente da molti client ma non riesco
da uno in particolare e non capisco perché. Il server accetta esclusivamente
autenticazione via chiave.
Se provo a collegarmi al server dal client problematico ho questo log
(anonimizzato, ovviamente) nel quale non riesco a trovare errori:
~ ssh -v dominio.org
OpenSSH_9.3p1, OpenSSL 3.1.1 30 May 2023
debug1: Reading configuration data /home/utente/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to dominio.org [IP.IP.IP.IP] port 22.
debug1: Connection established.
debug1: identity file /home/utente/.ssh/id_rsa type 0
debug1: identity file /home/utente/.ssh/id_rsa-cert type -1
debug1: identity file /home/utente/.ssh/id_ecdsa type -1
debug1: identity file /home/utente/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/utente/.ssh/id_ecdsa_sk type -1
debug1: identity file /home/utente/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /home/utente/.ssh/id_ed25519 type 3
debug1: identity file /home/utente/.ssh/id_ed25519-cert type -1
debug1: identity file /home/utente/.ssh/id_ed25519_sk type -1
debug1: identity file /home/utente/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /home/utente/.ssh/id_xmss type -1
debug1: identity file /home/utente/.ssh/id_xmss-cert type -1
debug1: identity file /home/utente/.ssh/id_dsa type -1
debug1: identity file /home/utente/.ssh/id_dsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_9.3
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.4p1
Debian-5+deb11u1
debug1: compat_banner: match: OpenSSH_8.4p1 Debian-5+deb11u1 pat OpenSSH*
compat 0x04000000
debug1: Authenticating to dominio.org:22 as 'utente'
debug1: load_hostkeys: fopen /home/utente/.ssh/known_hosts2: No such file or
directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or
directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or
directory
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ssh-ed25519
debug1: kex: server->client cipher: chacha20-poly1...@openssh.com MAC:
<implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1...@openssh.com MAC:
<implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: SSH2_MSG_KEX_ECDH_REPLY received
debug1: Server host key: ssh-ed25519
SHA256:/6jSA7Pc5b3+/ashKdTnDbiF0VF8VE4rxaKTzl6e+Z8
debug1: load_hostkeys: fopen /home/utente/.ssh/known_hosts2: No such file or
directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or
directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or
directory
debug1: Host 'dominio.org' is known and matches the ED25519 host key.
debug1: Found key in /home/utente/.ssh/known_hosts:343
debug1: rekey out after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey in after 134217728 blocks
debug1: get_agent_identities: bound agent to hostkey
debug1: get_agent_identities: agent returned 2 keys
debug1: Will attempt key: /home/utente/.ssh/id_ed25519 ED25519
SHA256:ID_DELLA_CHIAVE_ED25519 agent
debug1: Will attempt key: /home/utente/.ssh/id_rsa RSA
SHA256:ID_DELLA_CHIAVE_RSA agent
debug1: Will attempt key: /home/utente/.ssh/id_ecdsa
debug1: Will attempt key: /home/utente/.ssh/id_ecdsa_sk
debug1: Will attempt key: /home/utente/.ssh/id_ed25519_sk
debug1: Will attempt key: /home/utente/.ssh/id_xmss
debug1: Will attempt key: /home/utente/.ssh/id_dsa
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info:
server-sig-algs=<ssh-ed25519,sk-ssh-ed25...@openssh.com,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ecdsa-sha2-nistp...@openssh.com,webauthn-sk-ecdsa-sha2-nistp...@openssh.com>
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /home/utente/.ssh/id_ed25519 ED25519
SHA256:ID_DELLA_CHIAVE_ED25519 agent
debug1: Authentications that can continue: publickey
debug1: Offering public key: /home/utente/.ssh/id_rsa RSA
SHA256:ID_DELLA_CHIAVE_RSA agent
debug1: Authentications that can continue: publickey
debug1: Trying private key: /home/utente/.ssh/id_ecdsa
debug1: Trying private key: /home/utente/.ssh/id_ecdsa_sk
debug1: Trying private key: /home/utente/.ssh/id_ed25519_sk
debug1: Trying private key: /home/utente/.ssh/id_xmss
debug1: Trying private key: /home/utente/.ssh/id_dsa
debug1: No more authentication methods to try.
ute...@dominio.org: Permission denied (publickey).
Ovviamente le chiavi rsa e ed25519 sembrerebbero al loro posto sul server.
