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SSH Server Hardening
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| # Add this in /etc/ssh/sshd_config.d/00-hardening.conf | |
| # Then type sudo service sshd reload | |
| Protocol 2 | |
| Port 2222 | |
| PermitRootLogin no | |
| MaxAuthTries 3 | |
| LoginGraceTime 20 | |
| PasswordAuthentication no | |
| PermitEmptyPasswords no | |
| ChallengeResponseAuthentication no | |
| KerberosAuthentication no | |
| GSSAPIAuthentication no | |
| X11Forwarding no | |
| PermitUserEnvironment no | |
| AllowAgentForwarding no | |
| AllowTcpForwarding no | |
| PermitTunnel no | |
| DebianBanner no | |
| AllowUsers *@192.168.0.0/16 | |
| HostKey /etc/ssh/ssh_host_ed25519_key | |
| HostKey /etc/ssh/ssh_host_rsa_key | |
| KexAlgorithms curve25519-sha256@libssh.org | |
| 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 |
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