82 lines
2.2 KiB
Nix
82 lines
2.2 KiB
Nix
{
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services.openssh = {
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enable = true;
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startWhenNeeded = true;
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ports = [22];
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settings = {
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UseDns = true;
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PubkeyAuthentication = "yes";
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PermitRootLogin = "no";
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PermitEmptyPasswords = "no";
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PasswordAuthentication = false;
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# disable support for .rhost files
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IgnoreRhosts = "yes";
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# by default openssh uses port 22
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# restict key exchange, cipher, and MAC algorithms, as per <https://www.ssh-audit.com>
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KexAlgorithms = [
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"sntrup761x25519-sha512@openssh.com"
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"curve25519-sha256"
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"curve25519-sha256@libssh.org"
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"diffie-hellman-group18-sha512"
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"diffie-hellman-group-exchange-sha256"
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"diffie-hellman-group16-sha512"
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];
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Ciphers = [
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"chacha20-poly1305@openssh.com"
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"aes256-gcm@openssh.com"
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"aes256-ctr"
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"aes192-ctr"
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"aes128-gcm@openssh.com"
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"aes128-ctr"
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];
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Macs = [
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"hmac-sha2-512-etm@openssh.com"
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"hmac-sha2-256-etm@openssh.com"
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"umac-128-etm@openssh.com"
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];
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/*
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HostKeyAlgorithms = [
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"sk-ssh-ed25519-cert-v01@openssh.com"
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"ssh-ed25519-cert-v01@openssh.com"
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"rsa-sha2-512-cert-v01@openssh.com"
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"sk-ssh-ed25519@openssh.com,ssh-ed25519"
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"ssh-ed25519"
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"rsa-sha2-512"
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"rsa-sha2-256"
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];
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CASignatureAlgorithms = [
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"sk-ssh-ed25519@openssh.com"
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"ssh-ed25519"
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"rsa-sha2-512"
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"rsa-sha2-256"
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];
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GSSAPIKexAlgorithms = [
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"gss-curve25519-sha256-"
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"gss-group16-sha512"
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];
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HostbasedAcceptedAlgorithms = [
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"sk-ssh-ed25519-cert-v01@openssh.com"
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"ssh-ed25519-cert-v01@openssh.com"
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"rsa-sha2-512-cert-v01@openssh.com"
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"rsa-sha2-256-cert-v01@openssh.com"
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"sk-ssh-ed25519@openssh.com"
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"ssh-ed25519,rsa-sha2-512"
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"rsa-sha2-256"
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];
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PubkeyAcceptedAlgorithms = [
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"sk-ssh-ed25519-cert-v01@openssh.com"
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"ssh-ed25519-cert-v01@openssh.com"
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"rsa-sha2-512-cert-v01@openssh.com"
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"rsa-sha2-256-cert-v01@openssh.com"
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"sk-ssh-ed25519@openssh.com"
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"ssh-ed25519"
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"rsa-sha2-512"
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"rsa-sha2-256"
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];
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*/
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};
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};
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}
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