Allow specifying runing user and chroot() enviroment

Allow the admin to switch the user the kdc is running under and
specify the chroot() directory to run in.

Please note you need a very special setup to get this working.

kdc/config.c

@@ -64,6 +64,10 @@ static struct getarg_strings addresses_str;	/* addresses to listen on */
 
 static char *v4_realm;
 
+char *runas_string;
+char *chroot_string;
+
+
 static struct getargs args[] = {
     {
 	"config-file",	'c',	arg_string,	&config_file,
@@ -118,6 +122,12 @@ static struct getargs args[] = {
 	"disable DES" },
     {	"builtin-hdb",	0,	arg_flag,   &builtin_hdb_flag,
 	"list builtin hdb backends"},
+    {   "runas-user",	0,	arg_string, &runas_string,
+	"run as this user when connected to network"
+    },
+    {   "chroot",	0,	arg_string, &chroot_string,
+	"chroot directory to run in"
+    },
     {	"help",		'h',	arg_flag,   &help_flag },
     {	"version",	'v',	arg_flag,   &version_flag }
 };