idiosyn/modules/openssh.nix

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Nix
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2024-07-21 16:55:31 +02:00
{ lib, ...}:
let
ciphers = [
"chacha20-poly1305@openssh.com"
"aes256-gcm@openssh.com"
"aes128-gcm@openssh.com"
];
sigAlgorithms = [
"ssh-ed25519-cert-v01@openssh.com"
"ssh-ed25519"
];
kexAlgorithms = [
"sntrup761x25519-sha512@openssh.com"
"curve25519-sha256"
"curve25519-sha256@libssh.org"
];
macs = [
"umac-128-etm@openssh.com"
"hmac-sha2-512-etm@openssh.com"
"hmac-sha2-256-etm@openssh.com"
];
in {
programs.ssh = {
ciphers = lib.mkDefault ciphers;
kexAlgorithms = lib.mkDefault ciphers;
macs = lib.mkDefault macs;
hostKeyAlgorithms = lib.mkDefault sigAlgorithms;
pubkeyAcceptedKeyTypes = lib.mkDefault sigAlgorithms;
setXAuthLocation = lib.mkDefault false;
};
services.openssh = {
settings = {
PermitRootLogin = lib.mkDefault "no";
PasswordAuthentication = lib.mkDefault false;
KbdInteractiveAuthentication = lib.mkDefault false;
AuthenticationMethods = lib.mkDefault "publickey";
Ciphers = lib.mkDefault ciphers;
Macs = lib.mkDefault macs;
KexAlgorithms = lib.mkDefault kexAlgorithms;
HostKeyAlgorithms = lib.mkDefault (lib.concatStringsSep "," sigAlgorithms);
PubkeyAcceptedAlgorithms = lib.mkDefault (lib.concatStringsSep "," sigAlgorithms);
# Remove stale Unix sockets when forwarding
StreamLocalBindUnlink = lib.mkDefault true;
ClientAliveInterval = lib.mkDefault 900;
};
};
}