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57302eeb16
In order to keep configurations as small as possible and to make them easier to read/audit, this patch omits all default configuration in the OpenSSH server configuration file. Further, it mentions where to refer for the full documentation. Signed-off-by: Peter Müller <peter.mueller@ipfire.org> Reviewed-by: Michael Tremer <michael.tremer@ipfire.org> Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>
60 lines
1.8 KiB
Plaintext
60 lines
1.8 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# Only allow safe crypto algorithms (may break some _very_ outdated clients)
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# See also: https://stribika.github.io/2015/01/04/secure-secure-shell.html
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KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256
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Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,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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HostKey /etc/ssh/ssh_host_rsa_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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# Detect broken sessions by sending keep-alive messages to clients via SSH connection
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ClientAliveInterval 10
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# Close unresponsive SSH sessions which fail to answer keep-alive
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ClientAliveCountMax 6
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# Add support for SFTP
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Subsystem sftp /usr/lib/openssh/sftp-server
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# EOF
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