226 lines
5.9 KiB
Nix
226 lines
5.9 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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let
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cfg = config.services.samba;
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user = "smbguest";
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group = "smbguest";
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logDir = "/var/log/samba";
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privateDir = "/var/samba/private";
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inherit (pkgs) samba;
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setupScript =
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''
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if ! test -d /home/smbd ; then
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mkdir -p /home/smbd
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chown ${user} /home/smbd
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chmod a+rwx /home/smbd
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fi
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if ! test -d /var/samba ; then
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mkdir -p /var/samba/locks /var/samba/cores/nmbd /var/samba/cores/smbd /var/samba/cores/winbindd
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fi
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passwdFile="$(${pkgs.gnused}/bin/sed -n 's/^.*smb[ ]\+passwd[ ]\+file[ ]\+=[ ]\+\(.*\)/\1/p' ${configFile})"
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if [ -n "$passwdFile" ]; then
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echo 'INFO: [samba] creating directory containing passwd file'
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mkdir -p "$(dirname "$passwdFile")"
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fi
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mkdir -p ${logDir}
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mkdir -p ${privateDir}
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'';
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configFile = pkgs.writeText "smb.conf"
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''
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[ global ]
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log file = ${logDir}/log.%m
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private dir = ${privateDir}
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${optionalString cfg.syncPasswordsByPam "pam password change = true"}
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${if cfg.defaultShare.enable then ''
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[default]
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path = /home/smbd
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read only = ${if cfg.defaultShare.writeable then "no" else "yes"}
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guest ok = ${if cfg.defaultShare.guest then "yes" else "no"}
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''else ""}
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${cfg.extraConfig}
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'';
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# This may include nss_ldap, needed for samba if it has to use ldap.
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nssModulesPath = config.system.nssModules.path;
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daemonService = appName: args:
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{ description = "Samba Service daemon ${appName}";
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wantedBy = [ "samba.target" ];
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partOf = [ "samba.target" ];
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environment = {
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LD_LIBRARY_PATH = nssModulesPath;
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TZ = config.time.timeZone;
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LOCALE_ARCHIVE = "/run/current-system/sw/lib/locale/locale-archive";
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};
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serviceConfig = {
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ExecStart = "${samba}/sbin/${appName} ${args}";
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ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
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};
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restartTriggers = [ configFile ];
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};
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in
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{
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###### interface
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options = {
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# !!! clean up the descriptions.
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services.samba = {
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enable = mkOption {
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default = false;
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description = "
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Whether to enable Samba, which provides file and print
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services to Windows clients through the SMB/CIFS protocol.
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";
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};
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syncPasswordsByPam = mkOption {
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default = false;
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description = "
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enabling this will add a line directly after pam_unix.so.
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Whenever a password is changed the samba password will be updated as well.
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However you still yave to add the samba password once using smbpasswd -a user
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If you don't want to maintain an extra pwd database you still can send plain text
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passwords which is not secure.
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";
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};
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extraConfig = mkOption {
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# !!! Bad default.
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default = ''
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# [global] continuing global section here, section is started by nix to set pids etc
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smb passwd file = /etc/samba/passwd
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# is this useful ?
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domain master = auto
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encrypt passwords = Yes
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client plaintext auth = No
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# yes: if you use this you probably also want to enable syncPasswordsByPam
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# no: You can still use the pam password database. However
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# passwords will be sent plain text on network (discouraged)
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workgroup = Users
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server string = %h
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comment = Samba
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log file = /var/log/samba/log.%m
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log level = 10
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max log size = 50000
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security = ${cfg.securityType}
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client lanman auth = Yes
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dns proxy = no
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invalid users = root
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passdb backend = tdbsam
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passwd program = /usr/bin/passwd %u
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'';
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description = "
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additional global section and extra section lines go in here.
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";
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};
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configFile = mkOption {
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description = "
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internal use to pass filepath to samba pam module
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";
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};
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defaultShare = {
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enable = mkOption {
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description = "Whether to share /home/smbd as 'default'.";
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default = false;
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};
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writeable = mkOption {
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description = "Whether to allow write access to default share.";
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default = false;
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};
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guest = mkOption {
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description = "Whether to allow guest access to default share.";
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default = true;
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};
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};
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securityType = mkOption {
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description = "Samba security type";
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default = "user";
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example = "share";
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};
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};
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};
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###### implementation
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config = mkMerge
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[ { # Always provide a smb.conf to shut up programs like smbclient and smbspool.
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environment.etc = singleton
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{ source =
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if cfg.enable then configFile
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else pkgs.writeText "smb-dummy.conf" "# Samba is disabled.";
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target = "samba/smb.conf";
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};
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}
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(mkIf config.services.samba.enable {
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users.extraUsers = singleton
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{ name = user;
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description = "Samba service user";
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group = group;
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};
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users.extraGroups = singleton
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{ name = group;
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};
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boot.systemd = {
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targets.samba = {
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description = "Samba server";
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requires = [ "samba-setup.service" ];
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after = [ "samba-setup.service" "network.target" ];
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wantedBy = [ "multi-user.target" ];
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};
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services = {
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"samba-nmbd" = daemonService "nmbd" "-F";
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"samba-smbd" = daemonService "smbd" "-F";
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"samba-winbindd" = daemonService "winbindd" "-F";
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"samba-setup" = {
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description = "Samba setup task";
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script = setupScript;
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unitConfig.RequiresMountsFor = "/home/smbd /var/samba /var/log/samba";
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};
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};
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};
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})
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];
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}
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