137 lines
3 KiB
Nix
137 lines
3 KiB
Nix
{pkgs, config, ...}:
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let
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inherit (pkgs.lib) mkOption mkIf;
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inherit (pkgs) openssh;
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cfg = config.services.sshd;
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nssModulesPath = config.system.nssModules.path;
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sshdConfig = pkgs.writeText "sshd_config"
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''
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Protocol 2
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UsePAM yes
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${if cfg.forwardX11 then "
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X11Forwarding yes
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XAuthLocation ${pkgs.xlibs.xauth}/bin/xauth
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" else "
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X11Forwarding no
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"}
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${if cfg.allowSFTP then "
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Subsystem sftp ${openssh}/libexec/sftp-server
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" else "
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"}
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PermitRootLogin ${cfg.permitRootLogin}
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GatewayPorts ${cfg.gatewayPorts}
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'';
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permitRootLoginCheck = v:
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v == "yes" ||
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v == "without-password" ||
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v == "forced-commands-only" ||
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v == "no";
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in
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{
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###### interface
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options = {
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services.sshd = {
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enable = mkOption {
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default = false;
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description = ''
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Whether to enable the Secure Shell daemon, which allows secure
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remote logins.
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'';
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};
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forwardX11 = mkOption {
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default = true;
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description = ''
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Whether to allow X11 connections to be forwarded.
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'';
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};
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allowSFTP = mkOption {
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default = true;
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description = ''
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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</command> and
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<command>sshfs</command>.
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'';
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};
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permitRootLogin = mkOption {
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default = "yes";
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check = permitRootLoginCheck;
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description = ''
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Whether the root user can login using ssh. Valid values are
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<literal>yes</literal>, <literal>without-password</literal>,
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<literal>forced-commands-only</literal> or
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<literal>no</literal>.
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'';
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};
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gatewayPorts = mkOption {
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default = "no";
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description = ''
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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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<citerefentry><refentrytitle>sshd_config</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry>.
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'';
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};
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};
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};
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###### implementation
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config = mkIf config.services.sshd.enable {
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users.extraUsers = pkgs.lib.singleton
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{ name = "sshd";
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uid = config.ids.uids.sshd;
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description = "SSH privilege separation user";
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home = "/var/empty";
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};
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jobs.sshd = {
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description = "OpenSSH server";
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startOn = "network-interfaces/started";
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stopOn = "network-interfaces/stop";
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environment = { LD_LIBRARY_PATH = nssModulesPath; };
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preStart =
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''
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mkdir -m 0755 -p /etc/ssh
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if ! test -f /etc/ssh/ssh_host_dsa_key; then
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${openssh}/bin/ssh-keygen -t dsa -b 1024 -f /etc/ssh/ssh_host_dsa_key -N ""
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fi
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'';
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exec = "${openssh}/sbin/sshd -D -h /etc/ssh/ssh_host_dsa_key -f ${sshdConfig}";
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};
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networking.firewall.allowedTCPPorts = [22];
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};
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}
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