sshd_config

gistfile1.txt

# Server fingerprint
# Regenerate with: ssh-keygen -o -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa -b 4096
HostKey /etc/ssh/ssh_host_rsa_key
# Regerate with: ssh-keygen -o -f /etc/ssh/ssh_host_ed25519_key -N '' -t ed25519
HostKey /etc/ssh/ssh_host_ed25519_key

Port 22

# Log for audit, even users' key fingerprint
LogLevel VERBOSE

# Ciphers and keying
RekeyLimit 1G 1H
KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group18-sha512,diffie-hellman-group16-sha512,diffie-hellman-group14-sha256
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com

# Limit sessions and its duration
MaxAuthTries 3
MaxSessions 5
ClientAliveInterval 30
ClientAliveCountMax 6
TCPKeepAlive no

UsePAM yes
PasswordAuthentication no
ChallengeResponseAuthentication no
PubkeyAuthentication yes

# Enable AllowAgentForwarding if you need to jump through this host
AllowAgentForwarding yes
AllowTcpForwarding no
X11Forwarding no
PrintMotd no
Compression no

# Only if you really need it:
#AcceptEnv LANG LC_*

# Enable sftp only if needed
# For Arch Linux and Debian 10+
# Subsystem       sftp    /usr/lib/ssh/sftp-server
# For Debian/Ubuntu
Subsystem sftp /usr/lib/openssh/sftp-server -f AUTHPRIV -l INFO

# Set authorized keys file
# Prefer using an admin-controlled environment
# AuthorizedKeysFile      /etc/ssh/authorized_keys/%u
AuthorizedKeysFile      .ssh/authorized_keys

# Restrict SSH usage
#AllowUsers	<your username>
# Or restrict by group
AllowGroups sshusers