1 files changed, 96 insertions, 0 deletions
diff --git a/source/smbd/smbrun.c b/source/smbd/smbrun.c
new file mode 100644
index 00000000000..df12ae1f85c
--- /dev/null
+++ b/source/smbd/smbrun.c
@@ -0,0 +1,96 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 1.9.
+   external program running routine
+   Copyright (C) Andrew Tridgell 1992-1995
+   
+   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 one argument as argv[1] and runs it after becoming a non-root
+user
+*/
+int main(int argc,char *argv[])
+{
+  close_fds();
+
+  if (getuid() != geteuid())
+    {
+      int uid,gid;
+      
+      if (getuid() == 0)
+	uid = geteuid();
+      else
+	uid = getuid();
+      
+      if (getgid() == 0)
+	gid = getegid();
+      else
+	gid = getgid();
+      
+#ifdef USE_SETRES
+      setresgid(0,0,0);
+      setresuid(0,0,0);
+      setresgid(gid,gid,gid);
+      setresuid(uid,uid,uid);      
+#else      
+      setuid(0);
+      seteuid(0);
+      setgid(gid);
+      setegid(gid);
+      setuid(uid);
+      seteuid(uid);
+#endif
+
+      if (getuid() != uid)
+	return(3);
+    }
+
+  if (geteuid() != getuid())
+    return(1);
+
+  if (argc < 2)
+    return(2);
+
+  /* this is to make sure that the system() call doesn't run forever */
+  alarm(30);
+
+  return(system(argv[1]));
+}