1 files changed, 42 insertions, 1 deletions

diff --git a/nscd/nscd.c b/nscd/nscd.c
index 45928f0f67..bc291d81d9 100644
--- a/nscd/nscd.c
+++ b/nscd/nscd.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 1998, 1999 Free Software Foundation, Inc.
+/* Copyright (c) 1998, 1999, 2000 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1998.
 
@@ -62,6 +62,7 @@ int do_shutdown;
 int disabled_passwd;
 int disabled_group;
 int go_background = 1;
+const char *server_user;
 
 int secure[lastdb];
 int secure_in_use;
@@ -69,6 +70,7 @@ static const char *conffile = _PATH_NSCDCONF;
 
 static int check_pid (const char *file);
 static int write_pid (const char *file);
+static void drop_privileges (void);
 
 /* Name and version of program.  */
 static void print_version (FILE *stream, struct argp_state *state);
@@ -140,6 +142,8 @@ main (int argc, char **argv)
       if (fork ())
 	exit (0);
 
+      setsid ();
+
       chdir ("/");
 
       openlog ("nscd", LOG_CONS | LOG_ODELAY, LOG_DAEMON);
@@ -164,6 +168,10 @@ main (int argc, char **argv)
   /* Init databases.  */
   nscd_init (conffile);
 
+  /* Change to unprivileged UID if specifed in config file */
+  if(server_user && !secure_in_use)
+    drop_privileges ();
+
   /* Handle incoming requests */
   start_threads ();
 
@@ -364,3 +372,36 @@ write_pid (const char *file)
 
   return 0;
 }
+
+/* Look up the uid and gid associated with the user we are supposed to run
+   the server as, and then call setgid(), setgroups(), and setuid().
+   Otherwise, abort- we should not run as root if the configuration file
+   specifically tells us not to. */
+
+static void
+drop_privileges (void)
+{
+  int buflen = 256;
+  char *buffer = alloca (buflen);
+  struct passwd resultbuf;
+  struct passwd *pwd;
+
+  while (__getpwnam_r (server_user, &resultbuf, buffer, buflen, &pwd) != 0
+	 && errno == ERANGE)
+    {
+      errno = 0;
+      buflen += 256;
+      buffer = alloca (buflen);
+    }
+
+  if(!pwd)
+    {
+      dbg_log (_("Failed to look up user '%s' to run server as"),
+	       server_user);
+      exit(1);
+    }
+
+  setgroups (0, NULL);
+  setgid (pwd->pw_gid);
+  setuid (pwd->pw_uid);
+}