ubuntu - SSH Desactiva la autenticación de contraseña

ubuntu-12.04

Question

Estoy buscando una forma de deshabilitar a los clientes de ssh para que no accedan a la solicitud de contraseña como se indica here

No puedo deshabilitar la password: solicite el inicio de sesión raíz. He cambiado el archivo sshd_config para que lea:

ChallengeResponseAuthentication no
PasswordAuthentication no
UsePAM no

y también han cambiado los permisos chmod 700 ~/.ssh y chmod 600 ~/.ssh/authorized_keys . ¿Qué me estoy perdiendo? ¿Esto requiere que tenga una frase de contraseña?

Verbose dump:

debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/user/.ssh/id_rsa
debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /home/user/.ssh/id_dsa
debug1: Trying private key: /home/user/.ssh/id_ecdsa
debug1: Next authentication method: password

/ etc / ssh / sshd_config:

# Package generated configuration file
# See the sshd_config(5) manpage for details
# What ports, IPs and protocols we listen for
Port 22
# Use these options to restrict which interfaces/protocols sshd will bind to
#ListenAddress ::
#ListenAddress 0.0.0.0
Protocol 2
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes
# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 768
# Logging
SyslogFacility AUTH
LogLevel INFO
# Authentication:
LoginGraceTime 120
PermitRootLogin no
StrictModes yes
RSAAuthentication yes
PubkeyAuthentication yes
#AuthorizedKeysFile %h/.ssh/authorized_keys
# Don''t read the user''s ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
# For this to work you will also need host keys in /etc/ssh_known_hosts
RhostsRSAAuthentication no
# similar for protocol version 2
HostbasedAuthentication no
# Uncomment if you don''t trust ~/.ssh/known_hosts for RhostsRSAAuthentication
#IgnoreUserKnownHosts yes
# To enable empty passwords, change to yes (NOT RECOMMENDED)
PermitEmptyPasswords no
# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
ChallengeResponseAuthentication no
# Change to no to disable tunnelled clear text passwords
#PasswordAuthentication no
# Kerberos options
#KerberosAuthentication no
#KerberosGetAFSToken no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes
#UseLogin no
#MaxStartups 10:30:60
Banner /etc/issue.net
# Allow client to pass locale environment variables
AcceptEnv LANG LC_*
Subsystem sftp /usr/lib/openssh/sftp-server
# Set this to ''yes'' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication. Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to ''no''.
UsePAM no

Answer 1

Aquí hay un script para hacer esto automáticamente

# only allow key based logins
sed -n ''H;${x;s//#PasswordAuthentication yes/PasswordAuthentication no/;p;}'' /etc/ssh/sshd_config > tmp_sshd_config
cat tmp_sshd_config > /etc/ssh/sshd_config
rm tmp_sshd_config

Answer 2

Esto es de un tutorial que tengo:

En su máquina como raíz:

ssh-keygen -t rsa

y deja la frase de contraseña vacía

Desde su máquina local: (y deberá ingresar la contraseña)

ssh root@remotemachine mkdir -p .ssh

entonces:

cat .ssh/id_rsa.pub | ssh root@remotemachine ''cat >> .ssh/authorized_keys''

Ahora puede iniciar sesión sin un aviso de pw

ssh root@remotemachine

link: http://www.linuxproblem.org/art_9.html si tuviera algún problema!

Answer 3

correr

service ssh restart

en lugar de

/etc/init.d/ssh restart

Esto podría funcionar.

Answer 4

en /etc/ssh/sshd_config

# Change to no to disable tunnelled clear text passwords
#PasswordAuthentication no

Descomente la segunda línea y, si es necesario, cambie de sí a no.

Entonces corre

service ssh restart