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|
{ customUtils, lib, config, hostName, pkgs, ... }:
with lib;
let
cfg = config.services.openssh;
Ciphers = [
"chacha20-poly1305@openssh.com"
"aes256-gcm@openssh.com"
"aes256-ctr"
];
Macs = [
"umac-128-etm@openssh.com"
"hmac-sha2-256-etm@openssh.com"
"hmac-sha2-512-etm@openssh.com"
"umac-128@openssh.com"
"hmac-sha2-256"
"hmac-sha2-512"
"umac-64-etm@openssh.com"
"umac-64@openssh.com"
];
KexAlgorithms = [
"sntrup761x25519-sha512@openssh.com"
"curve25519-sha256"
"curve25519-sha256@libssh.org"
"diffie-hellman-group-exchange-sha256"
];
HostKeyAlgorithms = [
"sk-ssh-ed25519-cert-v01@openssh.com"
"ssh-ed25519-cert-v01@openssh.com"
"rsa-sha2-256-cert-v01@openssh.com"
"rsa-sha2-512-cert-v01@openssh.com"
"sk-ssh-ed25519@openssh.com"
"ssh-ed25519"
"rsa-sha2-256"
"rsa-sha2-512"
];
CASignatureAlgorithms = [
"sk-ssh-ed25519@openssh.com"
"ssh-ed25519"
"rsa-sha2-256"
"rsa-sha2-512"
];
PubkeyAcceptedAlgorithms = [
"ssh-ed25519-cert-v01@openssh.com"
"sk-ssh-ed25519-cert-v01@openssh.com"
"rsa-sha2-512-cert-v01@openssh.com"
"rsa-sha2-256-cert-v01@openssh.com"
"ssh-ed25519"
"ssh-rsa"
];
in {
options = {
services.openssh = {
staticHostKeys = mkOption {
type = types.bool;
default = pathExists (./host-keys + "/${hostName}.yaml");
};
};
};
config = {
systemd.user.services."ssh-agent".enable = mkForce false; # ssh-agent should be done via home-manager
services.openssh = mkIf cfg.enable {
hostKeys = mkIf cfg.staticHostKeys (mkForce []); # done manually
settings = {
inherit Ciphers Macs KexAlgorithms HostKeyAlgorithms CASignatureAlgorithms PubkeyAcceptedAlgorithms;
LogLevel = "VERBOSE";
RevokedKeys = "/etc/ssh/krl.bin";
PasswordAuthentication = mkDefault false;
KbdInteractiveAuthentication = mkDefault false;
};
moduliFile = mkIf (config.sops.secrets ? "ssh_moduli") "/run/credentials/sshd.service/ssh_moduli";
extraConfig = ''
${optionalString cfg.staticHostKeys "HostKey /run/credentials/sshd.service/ssh_host_ed25519_key"}
${optionalString (config.environment.etc ? "ssh/ssh_host_ed25519_key-cert.pub") "HostCertificate /etc/ssh/ssh_host_ed25519_key-cert.pub"}
${optionalString cfg.staticHostKeys "HostKey /run/credentials/sshd.service/ssh_host_rsa_key"}
${optionalString (config.environment.etc ? "ssh/ssh_host_rsa_key-cert.pub") "HostCertificate /etc/ssh/ssh_host_rsa_key-cert.pub"}
'';
};
systemd.services.sshd.serviceConfig.LoadCredential =
lib.optional (config.sops.secrets ? "ssh_moduli") "ssh_moduli:${config.sops.secrets.ssh_moduli.path}"
++ lib.optionals cfg.staticHostKeys [
"ssh_host_ed25519_key:${config.sops.secrets.ssh_host_ed25519_key.path}"
"ssh_host_rsa_key:${config.sops.secrets.ssh_host_rsa_key.path}"
];
programs.ssh = {
knownHosts = {
"*.yggdrasil.li" = {
extraHostNames = ["*.yggdrasil"];
certAuthority = true;
publicKeyFile = ./ca/ca.pub;
};
};
knownHostsFiles = [
./known-hosts/borgbase.keys
];
ciphers = Ciphers;
macs = Macs;
kexAlgorithms = KexAlgorithms;
hostKeyAlgorithms = HostKeyAlgorithms;
pubkeyAcceptedKeyTypes = PubkeyAcceptedAlgorithms;
extraConfig = ''
Host *
CASignatureAlgorithms ${concatStringsSep "," CASignatureAlgorithms}
PasswordAuthentication no
KbdInteractiveAuthentication no
'';
};
sops.secrets = mkIf cfg.enable {
ssh_host_rsa_key = mkIf cfg.staticHostKeys {
key = "rsa";
path = "/etc/ssh/ssh_host_rsa_key";
sopsFile = ./host-keys + "/${hostName}.yaml";
};
ssh_host_ed25519_key = mkIf cfg.staticHostKeys {
key = "ed25519";
path = "/etc/ssh/ssh_host_ed25519_key";
sopsFile = ./host-keys + "/${hostName}.yaml";
};
ssh_moduli = mkIf (pathExists (./host-moduli + "/${hostName}")) {
format = "binary";
path = "/etc/ssh/moduli";
sopsFile = ./host-moduli + "/${hostName}";
};
};
environment.etc = mkIf cfg.enable {
"ssh/ssh_host_rsa_key.pub" = mkIf cfg.staticHostKeys { source = ./known-hosts + "/${hostName}/rsa.pub"; };
"ssh/ssh_host_ed25519_key.pub" = mkIf cfg.staticHostKeys { source = ./known-hosts + "/${hostName}/ed25519.pub"; };
"ssh/ssh_host_rsa_key-cert.pub" = mkIf cfg.staticHostKeys { source = ./known-hosts + "/${hostName}/rsa-cert.pub"; };
"ssh/ssh_host_ed25519_key-cert.pub" = mkIf cfg.staticHostKeys { source = ./known-hosts + "/${hostName}/ed25519-cert.pub"; };
"ssh/krl.bin".source = ./ca/krl.bin;
};
environment.systemPackages = mkIf cfg.enable (with pkgs; [
alacritty.terminfo
]);
};
}
|
