Desativar autenticação de senha para SSH

Estou procurando uma maneira de desativar os clientes SSH de acessar o prompt de senha, conforme indicado aqui .

Não consigo desativar o password:prompt de login root . Eu mudei o sshd_configarquivo para ler:

ChallengeResponseAuthentication no
PasswordAuthentication no
UsePAM no

e também alteraram as permissões chmod 700 ~/.sshe chmod 600 ~/.ssh/authorized_keys. o que estou perdendo? Isso requer que eu tenha uma senha?

Despejo detalhado:

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

Arquivo / 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

No arquivo /etc/ssh/sshd_config

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

Remova o comentário da segunda linha e, se necessário, altere sim para não.

Então corra

service ssh restart

Corre

service ssh restart

ao invés de

/etc/init.d/ssh restart

Isso pode funcionar.

Aqui está um script para fazer isso automaticamente

# 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

Eu segui estas etapas (para Mac).

Em /etc/ssh/sshd_configmudança

#ChallengeResponseAuthentication yes
#PasswordAuthentication yes

para

ChallengeResponseAuthentication no
PasswordAuthentication no

Agora gere a chave RSA:

ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa

(Para mim, uma chave RSA funcionou. Uma chave DSA não funcionou.)

Uma chave privada será gerada ~/.ssh/id_rsajunto com ~/.ssh/id_rsa.pub(chave pública).

Agora vá para a pasta .ssh :cd ~/.ssh

Enter rm -rf authorized_keys(às vezes várias chaves levam a um erro).

Entrar vi authorized_keys

Entrar :wq para salvar este arquivo vazio

Entrar cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

Reinicie o SSH:

sudo launchctl stop com.openssh.sshd
sudo launchctl start com.openssh.sshd

Isso é de um tutorial que eu tenho:

Na sua máquina como root:

ssh-keygen -t rsa

E deixe a senha vazia.

Na sua máquina local (e você precisará digitar uma senha):

ssh root@remotemachine mkdir -p .ssh

Então:

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

Agora você pode efetuar login sem um prompt de senha

ssh root@remotemachine

Consulte o login SSH sem senha, caso tenha algum problema!