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{ config, lib, pkgs, ... }:
with lib;
let
/* minimal secure setup:
enable = true;
forceLocalLoginsSSL = true;
forceLocalDataSSL = true;
userlistDeny = false;
localUsers = true;
userlist = ["non-root-user" "other-non-root-user"];
rsaCertFile = "/var/vsftpd/vsftpd.pem";
*/
cfg = config.services.vsftpd;
inherit (pkgs) vsftpd;
yesNoOption = nixosName: vsftpdName: default: description: {
cfgText = "${vsftpdName}=${if getAttr nixosName cfg then "YES" else "NO"}";
nixosOption = {
type = types.bool;
name = nixosName;
value = mkOption {
inherit description default;
type = types.bool;
};
};
};
optionDescription = [
(yesNoOption "anonymousUser" "anonymous_enable" false ''
Whether to enable the anonymous FTP user.
'')
(yesNoOption "localUsers" "local_enable" false ''
Whether to enable FTP for local users.
'')
(yesNoOption "writeEnable" "write_enable" false ''
Whether any write activity is permitted to users.
'')
(yesNoOption "anonymousUploadEnable" "anon_upload_enable" false ''
Whether any uploads are permitted to anonymous users.
'')
(yesNoOption "anonymousMkdirEnable" "anon_mkdir_write_enable" false ''
Whether any uploads are permitted to anonymous users.
'')
(yesNoOption "chrootlocalUser" "chroot_local_user" false ''
Whether local users are confined to their home directory.
'')
(yesNoOption "userlistEnable" "userlist_enable" false ''
Whether users are included.
'')
(yesNoOption "userlistDeny" "userlist_deny" false ''
Specifies whether <option>userlistFile</option> is a list of user
names to allow or deny access.
The default <literal>false</literal> means whitelist/allow.
'')
(yesNoOption "forceLocalLoginsSSL" "force_local_logins_ssl" false ''
Only applies if <option>sslEnable</option> is true. Non anonymous (local) users
must use a secure SSL connection to send a password.
'')
(yesNoOption "forceLocalDataSSL" "force_local_data_ssl" false ''
Only applies if <option>sslEnable</option> is true. Non anonymous (local) users
must use a secure SSL connection for sending/receiving data on data connection.
'')
(yesNoOption "ssl_tlsv1" "ssl_tlsv1" true '' '')
(yesNoOption "ssl_sslv2" "ssl_sslv2" false '' '')
(yesNoOption "ssl_sslv3" "ssl_sslv3" false '' '')
];
configFile = pkgs.writeText "vsftpd.conf"
''
${concatMapStrings (x: "${x.cfgText}\n") optionDescription}
${optionalString (cfg.rsaCertFile != null) ''
ssl_enable=YES
rsa_cert_file=${cfg.rsaCertFile}
''}
${optionalString (cfg.userlistFile != null) ''
userlist_file=${cfg.userlistFile}
''}
background=YES
listen=YES
nopriv_user=vsftpd
secure_chroot_dir=/var/empty
syslog_enable=YES
${optionalString (pkgs.stdenv.system == "x86_64-linux") ''
seccomp_sandbox=NO
''}
anon_umask=${cfg.anonymousUmask}
'';
in
{
###### interface
options = {
services.vsftpd = {
enable = mkOption {
default = false;
description = "Whether to enable the vsftpd FTP server.";
};
userlist = mkOption {
default = [];
description = "See <option>userlistFile</option>.";
};
userlistFile = mkOption {
default = pkgs.writeText "userlist" (concatMapStrings (x: "${x}\n") cfg.userlist);
description = ''
Newline separated list of names to be allowed/denied if <option>userlistEnable</option>
is <literal>true</literal>. Meaning see <option>userlistDeny</option>.
The default is a file containing the users from <option>userlist</option>.
If explicitely set to null userlist_file will not be set in vsftpd's config file.
'';
};
anonymousUserHome = mkOption {
type = types.path;
default = "/home/ftp/";
description = ''
Directory to consider the HOME of the anonymous user.
'';
};
rsaCertFile = mkOption {
type = types.nullOr types.path;
default = null;
description = "RSA certificate file.";
};
anonymousUmask = mkOption {
type = types.string;
default = "077";
example = "002";
description = "Anonymous write umask.";
};
} // (listToAttrs (catAttrs "nixosOption" optionDescription));
};
###### implementation
config = mkIf cfg.enable {
assertions = singleton
{ assertion =
(cfg.forceLocalLoginsSSL -> cfg.rsaCertFile != null)
&& (cfg.forceLocalDataSSL -> cfg.rsaCertFile != null);
message = "vsftpd: If forceLocalLoginsSSL or forceLocalDataSSL is true then a rsaCertFile must be provided!";
};
users.extraUsers =
[ { name = "vsftpd";
uid = config.ids.uids.vsftpd;
description = "VSFTPD user";
home = "/homeless-shelter";
}
] ++ optional cfg.anonymousUser
{ name = "ftp";
uid = config.ids.uids.ftp;
group = "ftp";
description = "Anonymous FTP user";
home = cfg.anonymousUserHome;
};
users.extraGroups.ftp.gid = config.ids.gids.ftp;
# If you really have to access root via FTP use mkOverride or userlistDeny
# = false and whitelist root
services.vsftpd.userlist = if cfg.userlistDeny then ["root"] else [];
systemd.services.vsftpd =
{ description = "Vsftpd Server";
wantedBy = [ "multi-user.target" ];
preStart =
optionalString cfg.anonymousUser
''
mkdir -p -m 555 ${cfg.anonymousUserHome}
chown -R ftp:ftp ${cfg.anonymousUserHome}
'';
serviceConfig.ExecStart = "@${vsftpd}/sbin/vsftpd vsftpd ${configFile}";
serviceConfig.Restart = "always";
serviceConfig.Type = "forking";
};
};
}
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