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0712a67744
This key has been removed on new installations. Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
63 lines
1.9 KiB
Plaintext
63 lines
1.9 KiB
Plaintext
# OpenSSH server configuration file for IPFire
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#
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# The full documentation is available at: https://man.openbsd.org/sshd_config
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#
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# Only allow version 2 of SSH protocol
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Protocol 2
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# Listen on port 22 by default
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Port 22
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# Listen on every interface and IPv4 only
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AddressFamily inet
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ListenAddress 0.0.0.0
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# Limit authentication timeout to 30 seconds
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LoginGraceTime 30s
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# Limit maximum instanctes to prevent DoS
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MaxStartups 5
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# Only allow safe crypto algorithms
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KexAlgorithms sntrup761x25519-sha512,sntrup761x25519-sha512@openssh.com,mlkem768x25519-sha256,curve25519-sha256,curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256
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Ciphers aes256-gcm@openssh.com,aes256-ctr,chacha20-poly1305@openssh.com,aes192-ctr,aes128-gcm@openssh.com,aes128-ctr
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MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512,hmac-sha2-256,umac-128@openssh.com
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# Only allow cryptographically safe SSH host keys (adjust paths if needed)
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HostKey /etc/ssh/ssh_host_ed25519_key
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HostKey /etc/ssh/ssh_host_ecdsa_key
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# Only allow login via public key by default
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PubkeyAuthentication yes
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PasswordAuthentication no
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ChallengeResponseAuthentication no
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# Permit root login as there is no other user in IPFire 2.x
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PermitRootLogin yes
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# Ignore user ~/.ssh/known_hosts file
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IgnoreUserKnownHosts yes
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# Do not allow any kind of forwarding (provides only low security);
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# some of them might need to be re-enabled if SSH server is a jump platform
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AllowTcpForwarding no
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AllowAgentForwarding no
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PermitOpen none
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# Send SSH-based keep alive messages to connected clients to avoid broken connections
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ClientAliveInterval 10
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ClientAliveCountMax 30
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# Since TCP keep alive messages can be spoofed and we have the SSH-based already,
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# there is no need for this to be enabled as well
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TCPKeepAlive no
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# Add support for SFTP
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Subsystem sftp /usr/lib/openssh/sftp-server
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# Include additional sshd config files.
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Include /etc/ssh/sshd_config.d/*.conf
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# EOF
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