SSH Pubkey Serveriuose

Naudojimasis

ssh-keygen
cat /root/.ssh/id_rsa.pub

Dedame šį key į nutolusio serverio norimo vartotojo namų katalogo .ssh/authorized_keys bei nustatome teises:

chmod -R 700 .ssh/

Dabar galime prisijungti į serverį be slaptažodžio

ssh username@serveris.lt

SSH Agentas

Agentas duoda galimybę prisijungti prie serverių kaskartą neįvedinėjant slaptažodžių, paleidžiam ssh-agent

ssh-agent

Įdedame savo private key į atmintį (reiks suvesti passhare):

ssh-add ~/.ssh/id_rsa

Detalesnis derinimas

Norint, kad jūsų public key veiktų normaliai, nutolusiuose serveriuose reikia atlikti šiuos veiksmus:

• Pirmiausia įdėti key į ~/.ssh/authorized_keys ir priskirti normalias teises.
• Sutvarkyti patį sshd daemono konfigą.

Įdedam key ir sutvarkom teises:

echo "mano kietas key" >> ~/.ssh/authorized_keys
chmod go-w ~/
chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys

ARBA

ssh-copy-id -i ~/.ssh/id_rsa.pub SERVERIO_HOSTAS

Pats /etc/ssh/sshd_config turi atrodyti maždaug taip:

# 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
HostKey /etc/ssh/ssh_host_ed25519_key
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes 
# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 1024
# Logging
SyslogFacility AUTH
LogLevel INFO
# Authentication:
LoginGraceTime 120
PermitRootLogin without-password
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 yes
# 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 yes
# 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 yes

Svarbiausia, šios eilutės:

RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile      %h/.ssh/authorized_keys

Padarius ssh serverio konfigo pakeitimus, nepamirštame perkrauti ir pačio serviso:

service ssh restart

Visada turėk atsarginį įėima

echo "echo \"TAVO_SSH_KEY\" > ~/.ssh/authorized_keys" >> ~/.bash_logout

Sudo ssh agento praleidimas

i /etc/sudoers irasom

Defaults    env_keep+=SSH_AUTH_SOCK