2022-11-21 12:56:57 +01:00
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{% if hardening_sshd_enabled %}
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Protocol 2 # Protocol 1 is fundamentally broken
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StrictModes yes # Protects from misconfiguration
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#ListenAddress [ip-here] # Listening address
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2022-11-21 16:52:36 +01:00
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Port {{ sshd_port }} # Listening port. Normal 22
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2022-11-21 12:56:57 +01:00
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AuthenticationMethods publickey # Only public key authentication allowed
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AuthorizedKeysFile {{ hardening_sshd_authorized_key_file }}
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PubkeyAuthentication yes # Allow public key authentication
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HostKey /etc/ssh/ssh_host_ed25519_key # Only allow ECDSA pubic key authentication
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HostKeyAlgorithms ssh-ed25519-cert-v01@openssh.com,ssh-ed25519 # Host keys the client should accepts
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KexAlgorithms curve25519-sha256 # Specifies the available KEX (Key Exchange) algorithms
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Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com # Specifies the ciphers allowed
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MACs hmac-sha2-512-etm@openssh.com # Specifies the available MAC alg.
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#Only allow incoming ECDSA and ed25519 sessions:
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HostbasedAcceptedKeyTypes ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519
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PubkeyAcceptedKeyTypes sk-ecdsa-sha2-nistp256@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,ssh-ed25519
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#CASignatureAlgorithms ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519
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PermitRootLogin WITHOUT-PASSWORD # Enable/disable root login
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#AllowUsers [username] # Authorized SSH users are inside the admin group
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MaxAuthTries 5 # Maximum allowed authentication attempts
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MaxSessions 2 # Maximum allowed sessions by the user
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PasswordAuthentication no # No username password authentication
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PermitEmptyPasswords no # No empty password authentcation allowed
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IgnoreRhosts yes # Dont read users rhost files
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HostbasedAuthentication no # Disable host-based authentication
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ChallengeResponseAuthentication no # Unused authentication scheme
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X11Forwarding no # Disable X11 forwarding
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LogLevel VERBOSE # Fingerprint details of failed login attempts
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SyslogFacility AUTH # Logging authentication and authorization related commands
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UseDNS no # Client from a location without proper DNS generate a warning in the logs
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PermitTunnel no # Only SSH connection and nothing else
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AllowTcpForwarding {{ 'yes' if hardening_sshd_tcp_forward else 'no' }} # Disablow tunneling out via SSH
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AllowStreamLocalForwarding no # Disablow tunneling out via SSH
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GatewayPorts no # Disablow tunneling out via SSH
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AllowAgentForwarding no # Do not allow agent forwarding
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{% if hardening_sshd_legal_banner %}
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Banner /etc/issue.net # Show legal login banner
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{% endif %}
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PrintLastLog yes # Show last login
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ClientAliveInterval 900 # Client timeout (15 minutes)
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ClientAliveCountMax 0 # This way enforces timeouts on the server side
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LoginGraceTime 30 # Authenticatin must happen within 30 seconds
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MaxStartups 2 # Max concurrent SSH sessions
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TCPKeepAlive yes # Do not use TCP keep-alive
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AcceptEnv LANG LC_* # Allow client to pass locale environment variables
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{% endif %}
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