1 files changed, 92 insertions, 0 deletions
diff --git a/source3/utils/smbrun.c b/source3/utils/smbrun.c
new file mode 100644
index 0000000000..2a94ac3235
--- /dev/null
+++ b/source3/utils/smbrun.c
@@ -0,0 +1,92 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 1.9.
+   external program running routine
+   Copyright (C) Andrew Tridgell 1992-1998
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+
+/*******************************************************************
+close the low 3 fd's and open dev/null in their place
+********************************************************************/
+static void close_fds(void)
+{
+  int fd;
+  int i;
+  close(0); close(1); close(2);
+  /* try and use up these file descriptors, so silly
+     library routines writing to stdout etc won't cause havoc */
+  for (i=0;i<3;i++) {
+    fd = open("/dev/null",O_RDWR,0);
+    if (fd < 0) fd = open("/dev/null",O_WRONLY,0);
+    if (fd != i) return;
+  }
+}
+
+
+/*
+This is a wrapper around the system() call to allow commands to run correctly 
+as non root from a program which is switching between root and non-root 
+
+It takes 3 arguments as uid,gid,command and runs command after
+becoming a non-root user */
+ int main(int argc,char *argv[])
+{
+  int uid,gid;
+
+  close_fds();
+
+  if (argc != 4) exit(2);
+
+  uid = atoi(argv[1]);
+  gid = atoi(argv[2]);
+
+  /* first become root - we may need to do this in order to lose
+     our privilages! */
+#ifdef HAVE_SETRESUID
+  setresgid(0,0,0);
+  setresuid(0,0,0);
+#else      
+  setuid(0);
+  seteuid(0);
+#endif
+
+#ifdef HAVE_SETRESUID
+  setresgid(gid,gid,gid);
+  setresuid(uid,uid,uid);      
+#else
+  setgid(gid);
+  setegid(gid);
+  setuid(uid);
+  seteuid(uid);
+#endif
+
+
+  /* paranoia :-) */
+  if (getuid() != uid)
+    return(3);
+
+  if (geteuid() != getuid())
+    return(4);
+
+  /* this is to make sure that the system() call doesn't run forever */
+  alarm(30);
+
+  return(system(argv[3]));
+}