711 lines
26 KiB
Nix
711 lines
26 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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# The splicing information needed for nativeBuildInputs isn't available
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# on the derivations likely to be used as `cfgc.package`.
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# This middle-ground solution ensures *an* sshd can do their basic validation
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# on the configuration.
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validationPackage = if pkgs.stdenv.buildPlatform == pkgs.stdenv.hostPlatform
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then cfgc.package
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else pkgs.buildPackages.openssh;
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# dont use the "=" operator
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settingsFormat =
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let
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# reports boolean as yes / no
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mkValueString = with lib; v:
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if isInt v then toString v
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else if isString v then v
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else if true == v then "yes"
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else if false == v then "no"
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else throw "unsupported type ${builtins.typeOf v}: ${(lib.generators.toPretty {}) v}";
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base = pkgs.formats.keyValue {
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mkKeyValue = lib.generators.mkKeyValueDefault { inherit mkValueString; } " ";
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};
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# OpenSSH is very inconsistent with options that can take multiple values.
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# For some of them, they can simply appear multiple times and are appended, for others the
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# values must be separated by whitespace or even commas.
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# Consult either sshd_config(5) or, as last resort, the OpehSSH source for parsing
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# the options at servconf.c:process_server_config_line_depth() to determine the right "mode"
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# for each. But fortunaly this fact is documented for most of them in the manpage.
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commaSeparated = [ "Ciphers" "KexAlgorithms" "Macs" ];
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spaceSeparated = [ "AuthorizedKeysFile" "AllowGroups" "AllowUsers" "DenyGroups" "DenyUsers" ];
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in {
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inherit (base) type;
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generate = name: value:
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let transformedValue = mapAttrs (key: val:
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if isList val then
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if elem key commaSeparated then concatStringsSep "," val
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else if elem key spaceSeparated then concatStringsSep " " val
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else throw "list value for unknown key ${key}: ${(lib.generators.toPretty {}) val}"
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else
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val
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) value;
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in
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base.generate name transformedValue;
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};
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configFile = settingsFormat.generate "sshd.conf-settings" (filterAttrs (n: v: v != null) cfg.settings);
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sshconf = pkgs.runCommand "sshd.conf-final" { } ''
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cat ${configFile} - >$out <<EOL
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${cfg.extraConfig}
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EOL
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'';
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cfg = config.services.openssh;
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cfgc = config.programs.ssh;
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nssModulesPath = config.system.nssModules.path;
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userOptions = {
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options.openssh.authorizedKeys = {
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keys = mkOption {
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type = types.listOf types.singleLineStr;
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default = [];
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description = lib.mdDoc ''
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A list of verbatim OpenSSH public keys that should be added to the
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user's authorized keys. The keys are added to a file that the SSH
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daemon reads in addition to the the user's authorized_keys file.
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You can combine the `keys` and
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`keyFiles` options.
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Warning: If you are using `NixOps` then don't use this
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option since it will replace the key required for deployment via ssh.
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'';
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example = [
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"ssh-rsa AAAAB3NzaC1yc2etc/etc/etcjwrsh8e596z6J0l7 example@host"
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"ssh-ed25519 AAAAC3NzaCetcetera/etceteraJZMfk3QPfQ foo@bar"
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];
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};
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keyFiles = mkOption {
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type = types.listOf types.path;
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default = [];
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description = lib.mdDoc ''
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A list of files each containing one OpenSSH public key that should be
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added to the user's authorized keys. The contents of the files are
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read at build time and added to a file that the SSH daemon reads in
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addition to the the user's authorized_keys file. You can combine the
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`keyFiles` and `keys` options.
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'';
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};
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};
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options.openssh.authorizedPrincipals = mkOption {
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type = with types; listOf types.singleLineStr;
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default = [];
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description = mdDoc ''
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A list of verbatim principal names that should be added to the user's
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authorized principals.
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'';
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example = [
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"example@host"
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"foo@bar"
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];
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};
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};
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authKeysFiles = let
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mkAuthKeyFile = u: nameValuePair "ssh/authorized_keys.d/${u.name}" {
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mode = "0444";
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source = pkgs.writeText "${u.name}-authorized_keys" ''
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${concatStringsSep "\n" u.openssh.authorizedKeys.keys}
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${concatMapStrings (f: readFile f + "\n") u.openssh.authorizedKeys.keyFiles}
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'';
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};
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usersWithKeys = attrValues (flip filterAttrs config.users.users (n: u:
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length u.openssh.authorizedKeys.keys != 0 || length u.openssh.authorizedKeys.keyFiles != 0
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));
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in listToAttrs (map mkAuthKeyFile usersWithKeys);
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authPrincipalsFiles = let
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mkAuthPrincipalsFile = u: nameValuePair "ssh/authorized_principals.d/${u.name}" {
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mode = "0444";
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text = concatStringsSep "\n" u.openssh.authorizedPrincipals;
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};
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usersWithPrincipals = attrValues (flip filterAttrs config.users.users (n: u:
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length u.openssh.authorizedPrincipals != 0
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));
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in listToAttrs (map mkAuthPrincipalsFile usersWithPrincipals);
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in
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{
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imports = [
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(mkAliasOptionModuleMD [ "services" "sshd" "enable" ] [ "services" "openssh" "enable" ])
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(mkAliasOptionModuleMD [ "services" "openssh" "knownHosts" ] [ "programs" "ssh" "knownHosts" ])
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(mkRenamedOptionModule [ "services" "openssh" "challengeResponseAuthentication" ] [ "services" "openssh" "kbdInteractiveAuthentication" ])
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(mkRenamedOptionModule [ "services" "openssh" "kbdInteractiveAuthentication" ] [ "services" "openssh" "settings" "KbdInteractiveAuthentication" ])
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(mkRenamedOptionModule [ "services" "openssh" "passwordAuthentication" ] [ "services" "openssh" "settings" "PasswordAuthentication" ])
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(mkRenamedOptionModule [ "services" "openssh" "useDns" ] [ "services" "openssh" "settings" "UseDns" ])
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(mkRenamedOptionModule [ "services" "openssh" "permitRootLogin" ] [ "services" "openssh" "settings" "PermitRootLogin" ])
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(mkRenamedOptionModule [ "services" "openssh" "logLevel" ] [ "services" "openssh" "settings" "LogLevel" ])
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(mkRenamedOptionModule [ "services" "openssh" "macs" ] [ "services" "openssh" "settings" "Macs" ])
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(mkRenamedOptionModule [ "services" "openssh" "ciphers" ] [ "services" "openssh" "settings" "Ciphers" ])
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(mkRenamedOptionModule [ "services" "openssh" "kexAlgorithms" ] [ "services" "openssh" "settings" "KexAlgorithms" ])
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(mkRenamedOptionModule [ "services" "openssh" "gatewayPorts" ] [ "services" "openssh" "settings" "GatewayPorts" ])
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(mkRenamedOptionModule [ "services" "openssh" "forwardX11" ] [ "services" "openssh" "settings" "X11Forwarding" ])
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];
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###### interface
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options = {
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services.openssh = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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Whether to enable the OpenSSH secure shell daemon, which
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allows secure remote logins.
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'';
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};
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startWhenNeeded = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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If set, {command}`sshd` is socket-activated; that
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is, instead of having it permanently running as a daemon,
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systemd will start an instance for each incoming connection.
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'';
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};
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allowSFTP = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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Whether to enable the SFTP subsystem in the SSH daemon. This
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enables the use of commands such as {command}`sftp` and
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{command}`sshfs`.
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'';
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};
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sftpServerExecutable = mkOption {
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type = types.str;
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example = "internal-sftp";
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description = lib.mdDoc ''
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The sftp server executable. Can be a path or "internal-sftp" to use
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the sftp server built into the sshd binary.
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'';
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};
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sftpFlags = mkOption {
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type = with types; listOf str;
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default = [];
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example = [ "-f AUTHPRIV" "-l INFO" ];
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description = lib.mdDoc ''
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Commandline flags to add to sftp-server.
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'';
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};
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ports = mkOption {
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type = types.listOf types.port;
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default = [22];
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description = lib.mdDoc ''
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Specifies on which ports the SSH daemon listens.
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'';
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};
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openFirewall = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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Whether to automatically open the specified ports in the firewall.
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'';
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};
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listenAddresses = mkOption {
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type = with types; listOf (submodule {
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options = {
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addr = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = lib.mdDoc ''
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Host, IPv4 or IPv6 address to listen to.
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'';
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};
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port = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = lib.mdDoc ''
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Port to listen to.
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'';
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};
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};
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});
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default = [];
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example = [ { addr = "192.168.3.1"; port = 22; } { addr = "0.0.0.0"; port = 64022; } ];
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description = lib.mdDoc ''
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List of addresses and ports to listen on (ListenAddress directive
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in config). If port is not specified for address sshd will listen
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on all ports specified by `ports` option.
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NOTE: this will override default listening on all local addresses and port 22.
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NOTE: setting this option won't automatically enable given ports
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in firewall configuration.
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'';
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};
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hostKeys = mkOption {
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type = types.listOf types.attrs;
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default =
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[ { type = "rsa"; bits = 4096; path = "/etc/ssh/ssh_host_rsa_key"; }
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{ type = "ed25519"; path = "/etc/ssh/ssh_host_ed25519_key"; }
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];
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example =
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[ { type = "rsa"; bits = 4096; path = "/etc/ssh/ssh_host_rsa_key"; rounds = 100; openSSHFormat = true; }
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{ type = "ed25519"; path = "/etc/ssh/ssh_host_ed25519_key"; rounds = 100; comment = "key comment"; }
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];
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description = lib.mdDoc ''
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NixOS can automatically generate SSH host keys. This option
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specifies the path, type and size of each key. See
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{manpage}`ssh-keygen(1)` for supported types
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and sizes.
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'';
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};
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banner = mkOption {
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type = types.nullOr types.lines;
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default = null;
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description = lib.mdDoc ''
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Message to display to the remote user before authentication is allowed.
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'';
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};
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authorizedKeysFiles = mkOption {
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type = types.listOf types.str;
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default = [];
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description = lib.mdDoc ''
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Specify the rules for which files to read on the host.
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This is an advanced option. If you're looking to configure user
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keys, you can generally use [](#opt-users.users._name_.openssh.authorizedKeys.keys)
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or [](#opt-users.users._name_.openssh.authorizedKeys.keyFiles).
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These are paths relative to the host root file system or home
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directories and they are subject to certain token expansion rules.
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See AuthorizedKeysFile in man sshd_config for details.
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'';
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};
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authorizedKeysCommand = mkOption {
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type = types.str;
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default = "none";
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description = lib.mdDoc ''
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Specifies a program to be used to look up the user's public
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keys. The program must be owned by root, not writable by group
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or others and specified by an absolute path.
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'';
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};
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authorizedKeysCommandUser = mkOption {
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type = types.str;
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default = "nobody";
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description = lib.mdDoc ''
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Specifies the user under whose account the AuthorizedKeysCommand
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is run. It is recommended to use a dedicated user that has no
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other role on the host than running authorized keys commands.
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'';
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};
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settings = mkOption {
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description = lib.mdDoc "Configuration for `sshd_config(5)`.";
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default = { };
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example = literalExpression ''
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{
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UseDns = true;
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PasswordAuthentication = false;
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}
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'';
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type = types.submodule ({name, ...}: {
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freeformType = settingsFormat.type;
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options = {
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AuthorizedPrincipalsFile = mkOption {
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type = types.str;
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default = "none"; # upstream default
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description = lib.mdDoc ''
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Specifies a file that lists principal names that are accepted for certificate authentication. The default
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is `"none"`, i.e. not to use a principals file.
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'';
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};
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LogLevel = mkOption {
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type = types.enum [ "QUIET" "FATAL" "ERROR" "INFO" "VERBOSE" "DEBUG" "DEBUG1" "DEBUG2" "DEBUG3" ];
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default = "INFO"; # upstream default
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description = lib.mdDoc ''
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Gives the verbosity level that is used when logging messages from sshd(8). Logging with a DEBUG level
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violates the privacy of users and is not recommended.
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'';
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};
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UseDns = mkOption {
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type = types.bool;
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# apply if cfg.useDns then "yes" else "no"
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default = false;
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description = lib.mdDoc ''
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Specifies whether sshd(8) should look up the remote host name, and to check that the resolved host name for
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the remote IP address maps back to the very same IP address.
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If this option is set to no (the default) then only addresses and not host names may be used in
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~/.ssh/authorized_keys from and sshd_config Match Host directives.
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'';
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};
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X11Forwarding = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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Whether to allow X11 connections to be forwarded.
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'';
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};
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PasswordAuthentication = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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Specifies whether password authentication is allowed.
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'';
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};
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PermitRootLogin = mkOption {
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default = "prohibit-password";
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type = types.enum ["yes" "without-password" "prohibit-password" "forced-commands-only" "no"];
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description = lib.mdDoc ''
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Whether the root user can login using ssh.
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'';
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};
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KbdInteractiveAuthentication = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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Specifies whether keyboard-interactive authentication is allowed.
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'';
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};
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GatewayPorts = mkOption {
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type = types.str;
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default = "no";
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description = lib.mdDoc ''
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Specifies whether remote hosts are allowed to connect to
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ports forwarded for the client. See
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{manpage}`sshd_config(5)`.
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'';
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};
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KexAlgorithms = mkOption {
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type = types.listOf types.str;
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default = [
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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-group-exchange-sha256"
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];
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description = lib.mdDoc ''
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Allowed key exchange algorithms
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Uses the lower bound recommended in both
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<https://stribika.github.io/2015/01/04/secure-secure-shell.html>
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and
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<https://infosec.mozilla.org/guidelines/openssh#modern-openssh-67>
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'';
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};
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Macs = mkOption {
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type = types.listOf types.str;
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default = [
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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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description = lib.mdDoc ''
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Allowed MACs
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Defaults to recommended settings from both
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<https://stribika.github.io/2015/01/04/secure-secure-shell.html>
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and
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<https://infosec.mozilla.org/guidelines/openssh#modern-openssh-67>
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'';
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};
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StrictModes = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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Whether sshd should check file modes and ownership of directories
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'';
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};
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Ciphers = mkOption {
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type = types.listOf types.str;
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default = [
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"chacha20-poly1305@openssh.com"
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"aes256-gcm@openssh.com"
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"aes128-gcm@openssh.com"
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"aes256-ctr"
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"aes192-ctr"
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"aes128-ctr"
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];
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description = lib.mdDoc ''
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Allowed ciphers
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Defaults to recommended settings from both
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<https://stribika.github.io/2015/01/04/secure-secure-shell.html>
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and
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<https://infosec.mozilla.org/guidelines/openssh#modern-openssh-67>
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'';
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};
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AllowUsers = mkOption {
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type = with types; nullOr (listOf str);
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default = null;
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description = lib.mdDoc ''
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If specified, login is allowed only for the listed users.
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See {manpage}`sshd_config(5)` for details.
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'';
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};
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DenyUsers = mkOption {
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type = with types; nullOr (listOf str);
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default = null;
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description = lib.mdDoc ''
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If specified, login is denied for all listed users. Takes
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precedence over [](#opt-services.openssh.settings.AllowUsers).
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See {manpage}`sshd_config(5)` for details.
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'';
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};
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AllowGroups = mkOption {
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type = with types; nullOr (listOf str);
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default = null;
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description = lib.mdDoc ''
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If specified, login is allowed only for users part of the
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listed groups.
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See {manpage}`sshd_config(5)` for details.
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'';
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};
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DenyGroups = mkOption {
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type = with types; nullOr (listOf str);
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default = null;
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description = lib.mdDoc ''
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If specified, login is denied for all users part of the listed
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groups. Takes precedence over
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[](#opt-services.openssh.settings.AllowGroups). See
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{manpage}`sshd_config(5)` for details.
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'';
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};
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};
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});
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};
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extraConfig = mkOption {
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type = types.lines;
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default = "";
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description = lib.mdDoc "Verbatim contents of {file}`sshd_config`.";
|
|
};
|
|
|
|
moduliFile = mkOption {
|
|
example = "/etc/my-local-ssh-moduli;";
|
|
type = types.path;
|
|
description = lib.mdDoc ''
|
|
Path to `moduli` file to install in
|
|
`/etc/ssh/moduli`. If this option is unset, then
|
|
the `moduli` file shipped with OpenSSH will be used.
|
|
'';
|
|
};
|
|
|
|
};
|
|
|
|
users.users = mkOption {
|
|
type = with types; attrsOf (submodule userOptions);
|
|
};
|
|
|
|
};
|
|
|
|
|
|
###### implementation
|
|
|
|
config = mkIf cfg.enable {
|
|
|
|
users.users.sshd =
|
|
{
|
|
isSystemUser = true;
|
|
group = "sshd";
|
|
description = "SSH privilege separation user";
|
|
};
|
|
users.groups.sshd = {};
|
|
|
|
services.openssh.moduliFile = mkDefault "${cfgc.package}/etc/ssh/moduli";
|
|
services.openssh.sftpServerExecutable = mkDefault "${cfgc.package}/libexec/sftp-server";
|
|
|
|
environment.etc = authKeysFiles // authPrincipalsFiles //
|
|
{ "ssh/moduli".source = cfg.moduliFile;
|
|
"ssh/sshd_config".source = sshconf;
|
|
};
|
|
|
|
systemd =
|
|
let
|
|
service =
|
|
{ description = "SSH Daemon";
|
|
wantedBy = optional (!cfg.startWhenNeeded) "multi-user.target";
|
|
after = [ "network.target" ];
|
|
stopIfChanged = false;
|
|
path = [ cfgc.package pkgs.gawk ];
|
|
environment.LD_LIBRARY_PATH = nssModulesPath;
|
|
|
|
restartTriggers = optionals (!cfg.startWhenNeeded) [
|
|
config.environment.etc."ssh/sshd_config".source
|
|
];
|
|
|
|
preStart =
|
|
''
|
|
# Make sure we don't write to stdout, since in case of
|
|
# socket activation, it goes to the remote side (#19589).
|
|
exec >&2
|
|
|
|
${flip concatMapStrings cfg.hostKeys (k: ''
|
|
if ! [ -s "${k.path}" ]; then
|
|
if ! [ -h "${k.path}" ]; then
|
|
rm -f "${k.path}"
|
|
fi
|
|
mkdir -m 0755 -p "$(dirname '${k.path}')"
|
|
ssh-keygen \
|
|
-t "${k.type}" \
|
|
${optionalString (k ? bits) "-b ${toString k.bits}"} \
|
|
${optionalString (k ? rounds) "-a ${toString k.rounds}"} \
|
|
${optionalString (k ? comment) "-C '${k.comment}'"} \
|
|
${optionalString (k ? openSSHFormat && k.openSSHFormat) "-o"} \
|
|
-f "${k.path}" \
|
|
-N ""
|
|
fi
|
|
'')}
|
|
'';
|
|
|
|
serviceConfig =
|
|
{ ExecStart =
|
|
(optionalString cfg.startWhenNeeded "-") +
|
|
"${cfgc.package}/bin/sshd " + (optionalString cfg.startWhenNeeded "-i ") +
|
|
"-D " + # don't detach into a daemon process
|
|
"-f /etc/ssh/sshd_config";
|
|
KillMode = "process";
|
|
} // (if cfg.startWhenNeeded then {
|
|
StandardInput = "socket";
|
|
StandardError = "journal";
|
|
} else {
|
|
Restart = "always";
|
|
Type = "simple";
|
|
});
|
|
|
|
};
|
|
in
|
|
|
|
if cfg.startWhenNeeded then {
|
|
|
|
sockets.sshd =
|
|
{ description = "SSH Socket";
|
|
wantedBy = [ "sockets.target" ];
|
|
socketConfig.ListenStream = if cfg.listenAddresses != [] then
|
|
map (l: "${l.addr}:${toString (if l.port != null then l.port else 22)}") cfg.listenAddresses
|
|
else
|
|
cfg.ports;
|
|
socketConfig.Accept = true;
|
|
# Prevent brute-force attacks from shutting down socket
|
|
socketConfig.TriggerLimitIntervalSec = 0;
|
|
};
|
|
|
|
services."sshd@" = service;
|
|
|
|
} else {
|
|
|
|
services.sshd = service;
|
|
|
|
};
|
|
|
|
networking.firewall.allowedTCPPorts = optionals cfg.openFirewall cfg.ports;
|
|
|
|
security.pam.services.sshd =
|
|
{ startSession = true;
|
|
showMotd = true;
|
|
unixAuth = cfg.settings.PasswordAuthentication;
|
|
};
|
|
|
|
# These values are merged with the ones defined externally, see:
|
|
# https://github.com/NixOS/nixpkgs/pull/10155
|
|
# https://github.com/NixOS/nixpkgs/pull/41745
|
|
services.openssh.authorizedKeysFiles =
|
|
[ "%h/.ssh/authorized_keys" "/etc/ssh/authorized_keys.d/%u" ];
|
|
|
|
services.openssh.settings.AuthorizedPrincipalsFile = mkIf (authPrincipalsFiles != {}) "/etc/ssh/authorized_principals.d/%u";
|
|
|
|
services.openssh.extraConfig = mkOrder 0
|
|
''
|
|
UsePAM yes
|
|
|
|
Banner ${if cfg.banner == null then "none" else pkgs.writeText "ssh_banner" cfg.banner}
|
|
|
|
AddressFamily ${if config.networking.enableIPv6 then "any" else "inet"}
|
|
${concatMapStrings (port: ''
|
|
Port ${toString port}
|
|
'') cfg.ports}
|
|
|
|
${concatMapStrings ({ port, addr, ... }: ''
|
|
ListenAddress ${addr}${optionalString (port != null) (":" + toString port)}
|
|
'') cfg.listenAddresses}
|
|
|
|
${optionalString cfgc.setXAuthLocation ''
|
|
XAuthLocation ${pkgs.xorg.xauth}/bin/xauth
|
|
''}
|
|
${optionalString cfg.allowSFTP ''
|
|
Subsystem sftp ${cfg.sftpServerExecutable} ${concatStringsSep " " cfg.sftpFlags}
|
|
''}
|
|
PrintMotd no # handled by pam_motd
|
|
AuthorizedKeysFile ${toString cfg.authorizedKeysFiles}
|
|
${optionalString (cfg.authorizedKeysCommand != "none") ''
|
|
AuthorizedKeysCommand ${cfg.authorizedKeysCommand}
|
|
AuthorizedKeysCommandUser ${cfg.authorizedKeysCommandUser}
|
|
''}
|
|
|
|
${flip concatMapStrings cfg.hostKeys (k: ''
|
|
HostKey ${k.path}
|
|
'')}
|
|
'';
|
|
|
|
system.checks = [
|
|
(pkgs.runCommand "check-sshd-config"
|
|
{
|
|
nativeBuildInputs = [ validationPackage ];
|
|
} ''
|
|
${concatMapStringsSep "\n"
|
|
(lport: "sshd -G -T -C lport=${toString lport} -f ${sshconf} > /dev/null")
|
|
cfg.ports}
|
|
${concatMapStringsSep "\n"
|
|
(la:
|
|
concatMapStringsSep "\n"
|
|
(port: "sshd -G -T -C ${escapeShellArg "laddr=${la.addr},lport=${toString port}"} -f ${sshconf} > /dev/null")
|
|
(if la.port != null then [ la.port ] else cfg.ports)
|
|
)
|
|
cfg.listenAddresses}
|
|
touch $out
|
|
'')
|
|
];
|
|
|
|
assertions = [{ assertion = if cfg.settings.X11Forwarding then cfgc.setXAuthLocation else true;
|
|
message = "cannot enable X11 forwarding without setting xauth location";}
|
|
(let
|
|
duplicates =
|
|
# Filter out the groups with more than 1 element
|
|
lib.filter (l: lib.length l > 1) (
|
|
# Grab the groups, we don't care about the group identifiers
|
|
lib.attrValues (
|
|
# Group the settings that are the same in lower case
|
|
lib.groupBy lib.strings.toLower (attrNames cfg.settings)
|
|
)
|
|
);
|
|
formattedDuplicates = lib.concatMapStringsSep ", " (dupl: "(${lib.concatStringsSep ", " dupl})") duplicates;
|
|
in
|
|
{
|
|
assertion = lib.length duplicates == 0;
|
|
message = ''Duplicate sshd config key; does your capitalization match the option's? Duplicate keys: ${formattedDuplicates}'';
|
|
})]
|
|
++ forEach cfg.listenAddresses ({ addr, ... }: {
|
|
assertion = addr != null;
|
|
message = "addr must be specified in each listenAddresses entry";
|
|
});
|
|
};
|
|
|
|
}
|