• This is the sshd server system-wide configuration file. See
• sshd_config(5) for more information.
• This sshd was compiled with PATH=/usr/local/bin:/usr/bin:/bin:/usr/games
• The strategy used for options in the default sshd_config shipped with
• OpenSSH is to specify options with their default value where
• possible, but leave them commented. Uncommented options override the
• default value.

Include /etc/ssh/sshd_config.d/*.conf

Port 22
#AddressFamily any
ListenAddress 192.168.1.0./24

#ListenAddress

HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
HostKey /etc/ssh/ssh_host_ed25519_key

• Ciphers and keying

#RekeyLimit default none

• Logging

#SyslogFacility AUTH
#LogLevel INFO

• Authentication:

#LoginGraceTime 2m
PermitRootLogin no
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10

PubkeyAuthentication yes

• Expect .ssh/authorized_keys2 to be disregarded by default in future.

AuthorizedKeysFile .ssh/authorized_keys .ssh/authorized_keys2

#AuthorizedPrincipalsFile none

#AuthorizedKeysCommand none
#AuthorizedKeysCommandUser nobody

• For this to work you will also need host keys in /etc/ssh/ssh_known_hosts

HostbasedAuthentication no

• Change to yes if you don't trust ~/.ssh/known_hosts for
• HostbasedAuthentication

#IgnoreUserKnownHosts no

• Don't read the user's ~/.rhosts and ~/.shosts files

#IgnoreRhosts yes

• To disable tunneled clear text passwords, change to no here!

PasswordAuthentication no
#PermitEmptyPasswords no

• Change to yes to enable challenge-response passwords (beware issues with
• some PAM modules and threads)

KbdInteractiveAuthentication no

• Kerberos options

#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no

• GSSAPI options

#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
#GSSAPIStrictAcceptorCheck yes
#GSSAPIKeyExchange no

• Set this to 'yes' to enable PAM authentication, account processing,
• and session processing. If this is enabled, PAM authentication will
• be allowed through the KbdInteractiveAuthentication and
• PasswordAuthentication. Depending on your PAM configuration,
• PAM authentication via KbdInteractiveAuthentication may bypass
• the setting of "PermitRootLogin prohibit-password".
• If you just want the PAM account and session checks to run without
• PAM authentication, then enable this but set PasswordAuthentication
• and KbdInteractiveAuthentication to 'no'.

UsePAM no

#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
X11Forwarding no
#X11DisplayOffset 10
#X11UseLocalhost yes
#PermitTTY yes
PrintMotd no
#PrintLastLog yes
#TCPKeepAlive yes
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS no
#PidFile /run/sshd.pid
#MaxStartups 10:30:100
#PermitTunnel no
#ChrootDirectory none
#VersionAddendum none

• no default banner path

#Banner none

• Allow client to pass locale environment variables

AcceptEnv LANG LC_*

• override default of no subsystems

Subsystem sftp /usr/lib/openssh/sftp-server

• Example of overriding settings on a per-user basis

#Match User anoncvs

• X11Forwarding no
• AllowTcpForwarding no
• PermitTTY no
• ForceCommand cvs server