137 lines
3.1 KiB
Nix
137 lines
3.1 KiB
Nix
{pkgs, config, ...}:
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###### interface
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let
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inherit (pkgs.lib) mkOption mkIf;
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options = {
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services = {
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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 enable sshd to forward X11 connections.
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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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description = "
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Whether the root user can login using ssh. Valid options
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are <command>yes</command>, <command>without-password</command>,
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<command>forced-commands-only</command> or
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<command>no</command>
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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 ports forwarded for the client. See man sshd_conf.
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";
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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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inherit (pkgs) writeText openssh;
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cfg = (config.services.sshd);
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nssModules = config.system.nssModules.list;
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nssModulesPath = config.system.nssModules.path;
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sshdConfig = writeText "sshd_config" ''
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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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sshdUid = (import ../system/ids.nix).uids.sshd;
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assertion = cfg.permitRootLogin == "yes" ||
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cfg.permitRootLogin == "without-password" ||
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cfg.permitRootLogin == "forced-commands-only" ||
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cfg.permitRootLogin == "no";
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in
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mkIf config.services.sshd.enable {
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require = [
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options
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];
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users = {
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extraUsers = [
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{ name = "sshd";
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uid = (import ../system/ids.nix).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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];
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};
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services = {
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extraJobs = [{
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name = "sshd";
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job = ''
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description "SSH server"
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start on network-interfaces/started
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stop on network-interfaces/stop
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env LD_LIBRARY_PATH=${nssModulesPath}
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start script
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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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end script
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respawn ${openssh}/sbin/sshd -D -h /etc/ssh/ssh_host_dsa_key -f ${sshdConfig}
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'';
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}];
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};
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}
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