# /etc/ssh/sshd_config
#
# This is the sshd server system-wide configuration file.  See
# sshd_config(5) for more information.

Port 22
#AddressFamily any
ListenAddress 0.0.0.0
ListenAddress ::

#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

# Limit Host Key Algorithms
HostKeyAlgorithms ssh-ed25519-cert-v01@openssh.com,ssh-ed25519

# Limit Key Exchange Algorithms
KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512,hmac-sha2-256,umac-128@openssh.com

# Logging
#SyslogFacility AUTH
LogLevel VERBOSE

#LoginGraceTime 2m
PermitRootLogin yes
#StrictModes yes
MaxAuthTries 3
MaxSessions 4

# Only allow root to login
AllowGroups root

# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
AuthorizedKeysFile .ssh/authorized_keys

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

# Change to no to disable s/key passwords
ChallengeResponseAuthentication 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 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

AllowAgentForwarding no
AllowTcpForwarding yes
#GatewayPorts no
#X11Forwarding no
#X11DisplayOffset 10
#X11UseLocalhost yes
#PermitTTY yes
PrintMotd no
PrintLastLog yes
TCPKeepAlive no
#UseLogin no
#PermitUserEnvironment no
Compression delayed
ClientAliveInterval 300
ClientAliveCountMax 2
#UseDNS no
#PidFile /run/sshd.pid
#MaxStartups 10:30:100
#PermitTunnel no
#ChrootDirectory none
#VersionAddendum none

# override default of no subsystems
Subsystem sftp /usr/lib64/misc/sftp-server