Port 22777
ListenAddress 0.0.0.0
#ListenAddress ::

# only listen to IPv4
AddressFamily inet

# only listen to IPv6
#AddressFamily inet6
AllowAgentForwarding no

# prevent TCP ports from being forwarded over SSH tunnels
# **please be aware that disabling TCP forwarding does not prevent port forwarding**
# any user with an interactive login shell can spin up his/her own instance of sshd
AllowTcpForwarding no

# prevent StreamLocal (Unix-domain socket) forwarding
AllowStreamLocalForwarding no

# disables all forwarding features
# overrides all other forwarding switches
DisableForwarding yes

# disallow remote hosts from connecting to forwarded ports
# i.e. forwarded ports are forced to bind to 127.0.0.1 instad of 0.0.0.0
GatewayPorts no

# prevent tun device forwarding
PermitTunnel no

# suppress MOTD
PrintMotd no

# disable X11 forwarding since it is not necessary
X11Forwarding no

########## Authentication ##########

# permit only the specified users to login
#AllowUsers k4yt3x

# permit only users within the specified groups to login
#AllowGroups k4yt3x

# uncomment the following options to permit only pubkey authentication
# be aware that this will disable password authentication
#   - AuthenticationMethods: permitted authentication methods
#   - PasswordAuthentication: set to no to disable password authentication
#   - UsePAM: set to no to disable all PAM authentication, also disables PasswordAuthentication when set to no
#AuthenticationMethods publickey
PasswordAuthentication yes
#UsePAM no

# PAM authentication enabled to make password authentication available
# remove this if password authentication is not needed
UsePAM yes
ChallengeResponseAuthentication no
MaxAuthTries 351
PermitEmptyPasswords no
PermitRootLogin yes
PubkeyAuthentication yes
## # explicitly define cryptography algorithms to avoid the use of weak algorithms
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
HostKeyAlgorithms rsa-sha2-512,rsa-sha2-256,ssh-ed25519
MACs hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,umac-128-etm@openssh.com

###  short moduli should be deactivated before enabling the use of diffie-hellman-group-exchange-sha256
###  see this link for more details: https://github.com/k4yt3x/sshd_config#deactivating-short-diffie-hellman-moduli
## #KexAlgorithms curve25519-sha256,curve25519-sha256@libssh.org,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha256
KexAlgorithms curve25519-sha256,curve25519-sha256@libssh.org,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256

########## Connection Preferences ##########

# number of client alive messages sent without client responding
ClientAliveCountMax 2

# send a keepalive message to the client when the session has been idle for 300 seconds
# this prevents/detects connection timeouts
ClientAliveInterval 300

# compression before encryption might cause security issues
Compression no

# prevent SSH trust relationships from allowing lateral movements
IgnoreRhosts yes

# log verbosely for addtional information
#LogLevel VERBOSE

# allow a maximum of two multiplexed sessions over a single TCP connection
MaxSessions 4

# enforce SSH server to only use SSH protocol version 2
# SSHv1 contains security issues and should be avoided at all costs
# SSHv1 is disabled by default after OpenSSH 7.0, but this option is
#   specified anyways to ensure this configuration file's compatibility
#   with older versions of OpenSSH server
Protocol 2

## Subsystem sftp /usr/lib/openssh/sftp-server
## Subsystem sftp /usr/libexec/openssh/sftp-server
Subsystem sftp internal-sftp
TCPKeepAlive yes
UseDNS no