Tengo una máquina ArchLinux (kernel 4.8.4-1) que intento convertir en un servidor SSH. Durante los últimos días he estado luchando para que funcione. He leído muchos artículos, tutoriales y otras cosas como esta, pero todos tienen el mismo aspecto y ninguno resuelve mi problema.
despues de correr
$ssh -vvv alagris@Oelkozadam
Yo obtengo:
OpenSSH_7.3p1, OpenSSL 1.0.2j 26 Sep 2016
debug1: Reading configuration data /home/alagris/.ssh/config
debug1: /home/alagris/.ssh/config line 1: Applying options for Oelkozadam
debug1: Reading configuration data /etc/ssh/ssh_config
debug2: resolving "oelkozadam" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to oelkozadam [192.168.7.145] port 22.
debug1: Connection established.
debug1: identity file /home/alagris/.ssh/test type 1
debug1: key_load_public: No such file or directory
debug1: identity file /home/alagris/.ssh/test-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.3
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.3
debug1: match: OpenSSH_7.3 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to oelkozadam:22 as 'alagris'
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-nist p521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,dif fie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: [email protected],ecdsa-sha2-nistp384-cert-v01@openss h.com,[email protected],[email protected],ssh-rsa-cert-v01@openssh. com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed2551 9,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected] om,[email protected],aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected] om,[email protected],aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc
debug2: MACs ctos: [email protected],[email protected],[email protected],hmac-sh [email protected],[email protected],[email protected],[email protected],hmac-sha2-256,h mac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],hmac-sh [email protected],[email protected],[email protected],[email protected],hmac-sha2-256,h mac-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-nist p521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,dif fie-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] om,[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected] om,[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],hmac-sh [email protected],[email protected],[email protected],[email protected],hmac-sha2-256,h mac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],hmac-sh [email protected],[email protected],[email protected],[email protected],hmac-sha2-256,h mac-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:LOy/ttmSoIpf6+H0jRYCVveaNrhjTRDV61fCx6CQxQ4
The authenticity of host 'oelkozadam (192.168.7.145)' can't be established.
ECDSA key fingerprint is SHA256:LOy/ttmSoIpf6+H0jRYCVveaNrhjTRDV61fCx6CQxQ4.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'oelkozadam,192.168.7.145' (ECDSA) to the list of known hosts.
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/alagris/.ssh/test (0x55ad2b5b8360), explicit, agent
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 53
debug3: input_userauth_banner
Welcome to Oelkozadam's remote workstation. Intruders are not so welcome.
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
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: /home/alagris/.ssh/test
debug3: send_pubkey_test
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
Permission denied (publickey).
Estos son los permisos:
chmod 700 ~/.ssh
chmod 644 ~/.ssh/authorized_keys
chown alagris:users ~/.ssh/authorized_keys
He generado claves con este comando:
ssh-keygen -b 3072 -f "~/.ssh/$key" -P "$pass" -C "$(whoami)@$(hostname)-$(date -I)"
y usé cat para agregar la clave pública a ~/.ssh/authorized_keys
~/.ssh/config tiene el siguiente aspecto:
Host Oelkozadam
IdentitiesOnly yes
IdentityFile ~/.ssh/test
/etc/ssh/sshd_config tiene el siguiente aspecto:
Port 22
AddressFamily any
ListenAddress 192.168.7.145
AllowUsers remote_user alagris
PermitRootLogin no
Banner /my/config/SSH_ServerBanner
PasswordAuthentication no
ChallengeResponseAuthentication no
AuthorizedKeysFile ~/.ssh/authorized_keys
ChallengeResponseAuthentication no
UsePAM yes
Subsystem sftp /usr/lib/ssh/sftp-server
PrintMotd no
"$systemctl edit sshd.socket" tiene el siguiente aspecto:
[Socket]
ListenStream=
ListenStream=22
No tengo idea de qué más podría hacer para que funcione. También intenté SSH desde mi computadora portátil Mac a través de LAN pero obtengo resultados similares.
(editar: eliminé todos los archivos en ~/.ssh y generé test y test.pub desde cero, agregué test.pub a ~/.ssh/authorized_keys, una vez más establecí permisos en todos estos archivos, reinicié la computadora, ejecuté
eval $(ssh-agent)
ssh-add ~/.ssh/test
y conectado de nuevo. La salida cambió ligeramente. Ahora dice:
Offering RSA public key: /home/alagris/.ssh/test
El anterior:
Offering RSA public key: /my/config/SSH/test
Probablemente fue culpa de algunos cambios no aplicados que se actualizaron después del reinicio. Además, un hecho interesante es que cuando recreé el archivo autorizado_keys, la clave que generé para mi computadora Mac se perdió y, sin embargo, el resultado de la conexión ssh es absolutamente el mismo. Es muy similar a la salida en la máquina local pero el final:
send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug1: Trying private key: /Users/alagris/.ssh/id_dsa
debug3: no such identity: /Users/alagris/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /Users/alagris/.ssh/id_ecdsa
debug3: no such identity: /Users/alagris/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /Users/alagris/.ssh/id_ed25519
debug3: no such identity: /Users/alagris/.ssh/id_ed25519: No such file or directory
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
Permission denied (publickey).
)
PD. Desearía poder ver registros provenientes directamente del servidor, pero parece que en ArchLinux no hay archivos como /var/log/auth.log. Sólo puedo ver journalctl, que parece estar bastante vacío.
Respuesta1
según tu .ssh/config
~/.ssh/config tiene el siguiente aspecto:
Host Oelkozadam
IdentitiesOnly yes
IdentityFile ~/.ssh/test
que utiliza ~/.ssh/testcomo clave privada, ¿aparece la clave pública correspondiente en el authorized_keysarchivo?
Además, mencionas una contraseña:
He generado claves con este comando:
ssh-keygen -b 3072 -f "~/.ssh/$key" -P "$pass" -C "$(whoami)@$(hostname)-$(date -I)"
¿Está cargada esta clave (usando ssh-add)?
Así que comprueba eso
- la parte pública de
~/.ssh/testestá en claves_autorizadas ~/.ssh/testestá cargado (usossh-add -l)
Respuesta2
No tengo idea de que pasó. Me di por vencido, pero luego de algunos reinicios, mágicamente comenzó a funcionar.