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sshd_config hardening
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| # Insert these at the beginning of an existing sshd_config file | |
| 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,hmac-ripemd160-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512,hmac-sha2-256,hmac-ripemd160,umac-128@openssh.com | |
| Protocol 2 | |
| HostKey /etc/ssh/ssh_host_ed25519_key | |
| HostKey /etc/ssh/ssh_host_rsa_key | |
| PasswordAuthentication no | |
| ChallengeResponseAuthentication no | |
| PubkeyAuthentication yes | |
| # Optional group restriction: | |
| # AllowGroups groupname | |
| # If using Tor hidden services: | |
| # ListenAddress 127.0.0.1:22 | |
| # | |
| # Also add this to /etc/tor/torrc | |
| # HiddenServiceDir /var/lib/tor/hidden_service/ssh | |
| # HiddenServicePort 22 127.0.0.1:22 | |
| # Generate server keys: | |
| # cd /etc/ssh | |
| # rm ssh_host_*key* | |
| # ssh-keygen -t ed25519 -f ssh_host_ed25519_key < /dev/null | |
| # ssh-keygen -t rsa -b 4096 -f ssh_host_rsa_key < /dev/null |
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